Cleanup the test mesh

src/dusk/engine/engine.c

@@ -123,6 +123,9 @@ void engineExit(void) {
 }
 
 errorret_t engineDispose(void) {
+  errorChain(meshDispose(&loadedMesh));
+  memoryFree(loadedVertices);
+
   sceneDispose();
   errorChain(gameDispose());
   entityManagerDispose();