Merge pull request #4629 from assimp/kimkulling/fix_leak_in_D3MFOpcPackage_issue-4628

Fix memory leak in D3MFOpcPackage

code/AssetLib/3MF/D3MFOpcPackage.cpp

@@ -186,6 +186,9 @@ D3MFOpcPackage::D3MFOpcPackage(IOSystem *pIOHandler, const std::string &rFile) :
 D3MFOpcPackage::~D3MFOpcPackage() {
     mZipArchive->Close(mRootStream);
     delete mZipArchive;
+    for (auto tex : mEmbeddedTextures) {
+        delete tex;
+    }
 }
 
 IOStream *D3MFOpcPackage::RootStream() const {