add some useful info for assert around SWIG_CAST_NEW_MEMORY

git-svn-id: https://swig.svn.sourceforge.net/svnroot/swig/trunk@11686 626c5289-ae23-0410-ae9c-e8d60b6d4f22

Lib/python/pyrun.swg

@@ -1089,7 +1089,7 @@ SWIG_Python_ConvertPtrAndOwn(PyObject *obj, void **ptr, swig_type_info *ty, int
               int newmemory = 0;
               *ptr = SWIG_TypeCast(tc,vptr,&newmemory);
               if (newmemory == SWIG_CAST_NEW_MEMORY) {
-                assert(own);
+                assert(own); /* badly formed typemap which will lead to a memory leak - it must set and use own to delete *ptr */
                 if (own)
                   *own = *own | SWIG_CAST_NEW_MEMORY;
               }