Handle default case, since it will never be reached

src/video_core/command_classes/vic.cpp

@@ -82,6 +82,9 @@ void Vic::Execute() {
                 case VideoPixelFormat::XBGR32:
                     target_format = AV_PIX_FMT_0BGR32;
                     break;
+                default:
+                    //Unreachable
+                    break;
             }
 
             sws_freeContext(scaler_ctx);