Fix all -Wconversion-null warnings

src/JSystem/J2DGraph/J2DPictureEx.cpp

@@ -917,7 +917,7 @@ JUTTexture* J2DPictureEx::getTexture(u8 param_0) const {
 
 u8 J2DPictureEx::getTextureCount() const {
     if (mMaterial == NULL) {
-        return NULL;
+        return 0;
     }
 
     return mMaterial->getTexGenBlock()->getTexGenNum();

src/JSystem/J3DGraphBase/J3DShape.cpp

@@ -227,7 +227,7 @@ void J3DShape::makeVtxArrayCmd() {
         if (array[i] != 0)
             GDSetArray((GXAttr)(i + GX_VA_POS), array[i], stride[i]);
         else
-            GDSetArrayRaw((GXAttr)(i + GX_VA_POS), NULL, stride[i]);
+            GDSetArrayRaw((GXAttr)(i + GX_VA_POS), 0, stride[i]);
     }
 }
 

src/JSystem/JAudio2/JASSimpleWaveBank.cpp

@@ -42,7 +42,7 @@ JASWaveArc* JASSimpleWaveBank::getWaveArc(u32 no) {
 int JASSimpleWaveBank::TWaveHandle::getWavePtr() const {
     void* base = mHeap->getBase();
     if (base == NULL) {
-        return NULL;
+        return 0;
     }
     return (intptr_t)base + mWaveInfo.field_0x08;
 }

src/JSystem/JAudio2/JAUSectionHeap.cpp

@@ -40,7 +40,7 @@ namespace {
             field_0x4 = stack_14.getNumFiles();
             field_0x8 = new s32[field_0x4];
             if (!field_0x8) {
-                field_0x4 = NULL;
+                field_0x4 = 0;
                 return;
             }
             for (u32 i = 0; i < field_0x4; i++) {

src/JSystem/JKernel/JKRAram.cpp

@@ -69,7 +69,7 @@ JKRAram::JKRAram(u32 audio_buffer_size, u32 audio_graph_size, s32 priority)
     if (mAramMemorySize) {
         mAramMemoryPtr = ARAlloc(mAramMemorySize);
     } else {
-        mAramMemoryPtr = NULL;
+        mAramMemoryPtr = 0;
     }
 
     OS_REPORT("ARAM audio area %08x: %08x\n", mAudioMemoryPtr, mAudioMemorySize);

src/JSystem/JKernel/JKRFileCache.cpp

@@ -192,7 +192,7 @@ u32 JKRFileCache::readResource(void* dst, u32 dstLength, u32, const char* path)
     if (findFile(finalPath, path)) {
         return readResource(dst, dstLength, filePath);
     }
-    return NULL;
+    return 0;
 }
 
 void JKRFileCache::removeResourceAll(void) {

src/JSystem/JKernel/JKRThread.cpp

@@ -73,7 +73,7 @@ void JKRThread::setCommon_mesgQueue(JKRHeap* heap, int message_count) {
     sThreadList.append(&mThreadListLink);
 
     mCurrentHeap = NULL;
-    mCurrentHeapError = NULL;
+    mCurrentHeapError = 0;
 }
 
 void JKRThread::setCommon_heapSpecified(JKRHeap* heap, u32 stack_size, int param_3) {

src/JSystem/JParticle/JPAEmitter.cpp

@@ -39,7 +39,7 @@ void JPABaseEmitter::init(JPAEmitterManager* param_0, JPAResource* param_1) {
     mGlobalPrmClr.r = mGlobalPrmClr.g = mGlobalPrmClr.b = mGlobalPrmClr.a = mGlobalEnvClr.r = mGlobalEnvClr.g = mGlobalEnvClr.b = mGlobalEnvClr.a = 0xff;
     param_1->getBsp()->getPrmClr(&mPrmClr);
     param_1->getBsp()->getEnvClr(&mEnvClr);
-    mpUserWork = NULL;
+    mpUserWork = 0;
     mScaleOut = 1.0f;
     mEmitCount = 0.0f;
     initStatus(0x30);