rlottie: fix warning regarding no return value

src/lottie/lottieparser.cpp

@@ -1250,6 +1250,7 @@ LOTTrimData::TrimType LottieParserImpl::getTrimType()
         break;
     default:
         RAPIDJSON_ASSERT(0);
+        return LOTTrimData::TrimType::Simultaneously;
         break;
     }
 }

src/vector/vmatrix.cpp

@@ -639,6 +639,7 @@ VRect VMatrix::map(const VRect &rect) const
     } else {
         // Not supported
         assert(0);
+        return {};
     }
 }