Fix a lot of pointer comparisons to 0 (or nothing) to explicitly use NULL

src/object/bakerOven.c

@@ -22,7 +22,7 @@ void sub_0809CC74(Entity* this) {
         /* Create steam clouds */
         for (i = 0; i < 3; i++) {
             ent = CreateObject(BAKER_OVEN, 1, i);
-            if (ent) {
+            if (ent != NULL) {
                 ent->parent = this;
                 PositionRelative(this, ent, 16 * Q_16_16((i + 1) / 2) - Q_16_16(8.0), Q_16_16(-14.0));
             }

src/object/bigBarrel.c

@@ -105,7 +105,7 @@ void sub_08088BE0(BigBarrelEntity* this) {
     if (CheckLocalFlag(0x15) == 0) {
         sub_08088C78(this, 2, 0, 0xffffff88);
         ent = sub_08088C78(this, 4, 0x15, 0);
-        if (ent) {
+        if (ent != NULL) {
             ent->x.HALF.HI = gRoomControls.origin_x + 0x48;
             ent->y.HALF.HI = gRoomControls.origin_y + 200;
         }
@@ -114,7 +114,7 @@ void sub_08088BE0(BigBarrelEntity* this) {
     if (CheckLocalFlag(0x16) == 0) {
         sub_08088C78(this, 2, 1, 0x78);
         ent = sub_08088C78(this, 4, 0x16, 0);
-        if (ent) {
+        if (ent != NULL) {
             ent->x.HALF.HI = gRoomControls.origin_x + 0x188;
             ent->y.HALF.HI = gRoomControls.origin_y + 200;
         }
@@ -249,7 +249,7 @@ void sub_08088E74(BigBarrelEntity* this) {
     } else {
         if ((gRoomTransition.frameCount & 7U) == 0) {
             ent = CreateObjectWithParent(super, OBJECT_2A, 0, 0x1e);
-            if (ent) {
+            if (ent != NULL) {
                 ent->updatePriority = 3;
                 ent->spriteRendering.b3 = 0;
                 ent->spritePriority.b0 = 0;

src/object/button.c

@@ -242,7 +242,7 @@ u32 sub_08081F7C(Entity* this, u32 r7) {
     if (this->actionDelay == 0)
         return 1;
     if (--this->actionDelay > 6) {
-        if (this->child)
+        if (this->child != NULL)
             this->child->spriteOffsetY = -4;
     } else {
         if (this->actionDelay == 6) {

src/object/fileScreenObjects.c

@@ -252,7 +252,7 @@ void sub_0808EABC(Entity* this) {
 
 void sub_0808EB74(Entity* this) {
     Entity* entity = sub_0808EC80(gMapDataBottomSpecial.unk6);
-    if (entity) {
+    if (entity != NULL) {
         this->x.WORD = entity->x.WORD;
         this->y.WORD = entity->y.WORD;
         this->spriteRendering.b3 = entity->spriteRendering.b3;
@@ -305,7 +305,7 @@ void sub_0808EBB8(Entity* this) {
             // Fall through
         default:
             entity = sub_0808EC80(var0);
-            if (entity) {
+            if (entity != NULL) {
                 SortEntityBelow(entity, this);
                 this->spriteRendering.b3 = entity->spriteRendering.b3;
                 x = entity->x.HALF.HI;

src/object/houseDoorExterior.c

@@ -53,7 +53,7 @@ void sub_080866D8(Entity* this) {
         if ((*((u32*)(&this->field_0x68)) & mask) == 0 && sub_080867CC(prop->unk5) &&
             CheckRegionOnScreen(prop->unk0, prop->unk2, 32, 32)) {
             entity = CreateObject(HOUSE_DOOR_EXT, prop->unk7, prop->unk6);
-            if (entity) {
+            if (entity != NULL) {
                 entity->field_0x6c.HALF.LO = i;
                 entity->x.HALF.HI = gRoomControls.origin_x + prop->unk0 + 16;
                 entity->y.HALF.HI = gRoomControls.origin_y + prop->unk2 + 32;
@@ -157,7 +157,7 @@ static void sub_080868EC(Entity* entity, unk_80868EC* arg1) {
 void sub_0808692C(Entity* this) {
     this->flags &= ~ENT_SCRIPTED;
     this->type2 = 2;
-    this->action = this->frameIndex == 0 ? 1 : 2;
+    this->action = (this->frameIndex == 0) ? 1 : 2;
     this->subAction = 0;
     this->actionDelay = 8;
 }

src/object/object49.c

@@ -195,7 +195,7 @@ void sub_0808F3DC(Entity* this) {
 
         if (this->type == 5 && (this->frame & 1)) {
             Entity* entity = CreateObjectWithParent(this->child, 0x49, 8, 0);
-            if (entity) {
+            if (entity != NULL) {
                 entity->parent = this->parent;
                 entity->child = this->parent->parent;
             }
@@ -262,19 +262,19 @@ void sub_0808F554(Entity* this) {
 
 void sub_0808F5EC(Entity* this) {
     Entity* entity = CreateObjectWithParent(this->child, 0x49, 5, 0);
-    if (entity) {
+    if (entity != NULL) {
         entity->parent = this;
         entity->child = this->child;
     }
 
     entity = CreateObjectWithParent(this->child, 0x49, 6, 0);
-    if (entity) {
+    if (entity != NULL) {
         entity->parent = this;
         entity->child = this->child;
     }
 
     entity = CreateObjectWithParent(this->child, 0x49, 7, 0);
-    if (entity) {
+    if (entity != NULL) {
         entity->parent = this;
         entity->child = this->child;
     }

src/object/pot.c

@@ -283,7 +283,7 @@ u32 sub_0808288C(Entity* this, u32 form, u32 arg2, u32 arg3) {
             break;
         default:
             entity = CreateObjectWithParent(this, GROUND_ITEM, form, arg2);
-            if (entity) {
+            if (entity != NULL) {
                 if (arg3 == 2) {
                     entity->actionDelay = 5;
                     entity->field_0x86.HWORD = this->field_0x86.HWORD;