free the allocated import

code/Assimp.cpp

@@ -96,6 +96,8 @@ namespace Assimp
     /** will return all registered importers. */
     void GetImporterInstanceList(std::vector< BaseImporter* >& out);
 
+    /** will delete all registered importers. */
+    void DeleteImporterInstanceList(std::vector< BaseImporter* >& out);
 } // namespace assimp
 
 
@@ -648,6 +650,8 @@ ASSIMP_API C_STRUCT const aiImporterDesc* aiGetImporterDesc( const char *extensi
         }
     }
 
+    DeleteImporterInstanceList(out);
+
     return desc;
 }