rpcrt4: We don't need to free object pointers if we are told we must allocate.

dlls/rpcrt4/ndr_marshall.c

@@ -822,7 +822,7 @@ static void PointerUnmarshall(PMIDL_STUB_MESSAGE pStubMsg,
   case RPC_FC_OP: /* object pointer - we must free data before overwriting it */
     pointer_id = NDR_LOCAL_UINT32_READ(Buffer);
     TRACE("pointer_id is 0x%08lx\n", pointer_id);
-    if (*pPointer)
+    if (!fMustAlloc && *pPointer)
         FIXME("free object pointer %p\n", *pPointer);
     break;
   case RPC_FC_FP: