Fix warning: enumeration value 'SDL_BLENDMODE_INVALID' not explicitly handled in switch

src/render/SDL_render.c

@@ -1206,6 +1206,9 @@ IsSupportedBlendMode(SDL_Renderer * renderer, SDL_BlendMode blendMode)
     case SDL_BLENDMODE_MUL:
         return SDL_TRUE;
 
+    case SDL_BLENDMODE_INVALID:
+        return SDL_FALSE;
+
     default:
         return renderer->SupportsBlendMode && renderer->SupportsBlendMode(renderer, blendMode);
     }