Fix some more GCC warnings, mark some bugs based on GCC warnings (#2309)

* Fix some more GCC warnings, mark some bugs based on GCC warnings

* Weird formatting

* Suggested changes

* More weird indentation I guess

* UNREACHABLE() macro, add missing NORETURNs to fault_n64.c

* AVOID_UB for PAL path in z_file_nameset.c

* Remove comments about return types

* Remove temp no longer needed

src/code/z_lights.c

@@ -182,8 +182,7 @@ LightNode* Lights_FindBufSlot(void) {
     return node;
 }
 
-// return type must not be void to match
-s32 Lights_FreeNode(LightNode* light) {
+BAD_RETURN(s32) Lights_FreeNode(LightNode* light) {
     if (light != NULL) {
         sLightsBuffer.numOccupied--;
         light->info = NULL;