Fix macOS build.

Author: kring

Source/CesiumRuntime/Private/CesiumGltfComponent.cpp

@@ -3148,7 +3148,8 @@ static void loadPrimitiveGameThreadPart(
 
 #if PLATFORM_MAC
   // TODO: figure out why water material crashes mac
-  UMaterialInterface* pBaseMaterial = is_in_blend_mode(loadResult)
+  UMaterialInterface* pUserDesignatedMaterial =
+      is_in_blend_mode(loadResult)
                                           ? pGltf->BaseMaterialWithTranslucency
                                           : pGltf->BaseMaterial;
 #else