Fix crash in res_xmpp when deleting pubsub node from CLI

An error existed in res_xmpp where it would attempt to delete attributes from
a node that itself was also deleted. Per the iksemel documentation, attributes
added using iks_insert are copied to the parent node's stack, and will be
reclaimed when that node is itself destroyed.

(closes issue ASTERISK-20982)
Reported by: marcelloceschia
patches:
  delete-node-fix.diff uploaded by marcelloceschia (License 6036)



git-svn-id: https://origsvn.digium.com/svn/asterisk/branches/11@381159 65c4cc65-6c06-0410-ace0-fbb531ad65f3

res/res_xmpp.c

@@ -1083,8 +1083,6 @@ static void xmpp_pubsub_delete_node(struct ast_xmpp_client *client, const char *
 	iks_insert_attrib(delete, "node", node_name);
 	ast_xmpp_client_send(client, request);
 
-	iks_delete(delete);
-	iks_delete(pubsub);
 	iks_delete(request);
 }