Protect the object destructors agains null pointers on deletion, which

should be something valid.


git-svn-id: https://pupnp.svn.sourceforge.net/svnroot/pupnp/trunk@534 119443c7-1b9e-41f8-b6fc-b9c35fce742c

upnp/src/api/UpnpString.c

@@ -74,6 +74,8 @@ void UpnpString_delete(UpnpString *p)
 {
 	struct SUpnpString *q = (struct SUpnpString *)p;
 		
+	if (!q) return;
+
 	q->m_length = 0;
 
 	free(q->m_string);