All: Fix some warnings

src/debugger/debugger.c

@@ -58,10 +58,11 @@ struct mDebuggerModule* mDebuggerCreateModule(enum mDebuggerType type, struct mC
 		break;
 #endif
 	case DEBUGGER_NONE:
+	case DEBUGGER_ACCESS_LOGGER:
 	case DEBUGGER_CUSTOM:
 	case DEBUGGER_MAX:
 		free(debugger);
-		return 0;
+		return NULL;
 		break;
 	}
 

src/platform/sdl/gl-common.c

@@ -170,7 +170,7 @@ void mSDLGLCommonRunloop(struct mSDLRenderer* renderer, void* user) {
 		renderer->core->currentVideoSize(renderer->core, &renderer->width, &renderer->height);
 		struct mRectangle dims;
 		v->layerDimensions(v, VIDEO_LAYER_IMAGE, &dims);
-		if (renderer->width != dims.width || renderer->height != dims.height) {
+		if (dims.width < 0 || dims.height < 0 || renderer->width != (unsigned) dims.width || renderer->height != (unsigned) dims.height) {
 			renderer->core->setVideoBuffer(renderer->core, renderer->outputBuffer, renderer->width);
 			dims.width = renderer->width;
 			dims.height = renderer->height;

src/util/sfo.c

@@ -161,6 +161,8 @@ bool SfoWrite(struct Table* sfo, struct VFile* vf) {
 			case PSF_TYPE_U32:
 				sortedEntries[i].size = 4;
 				break;
+			default:
+				return false;
 			}
 		}
 		dataSize += ALIGN4(sortedEntries[i].size);