Segfault when publishing device states via XMPP and not connected

When using publishing device state with res_jabber, Asterisk will attempt
to send a device state using the unconnected client using iks_send_raw
and crash. This patch checks the validity of the connection before 
attempting to send the device state.

(closes issue ASTERISK-18078)
Reported by: Michael L. Young
Patches:
      res_jabber-segfault-pubsub-not-connected2.patch (license #5026) patch uploaded by Michael L. Young
Tested by: Jonathan Rose



git-svn-id: https://origsvn.digium.com/svn/asterisk/branches/1.8@333265 65c4cc65-6c06-0410-ace0-fbb531ad65f3

res/res_jabber.c

@@ -1465,7 +1465,15 @@ static int aji_send_raw(struct aji_client *client, const char *xmlstr)
 #endif
 	/* If needed, data will be sent unencrypted, and logHook will
 	   be called inside iks_send_raw */
-	ret = iks_send_raw(client->p, xmlstr);
+	if((client->timeout != 0 && client->status == AJI_CONNECTED) || (client->status == AJI_CONNECTING))
+	{
+	    ret = iks_send_raw(client->p, xmlstr);
+	}
+	else {
+		ast_log(LOG_WARNING, "JABBER: Unable to send message to %s, we are not connected", client->name);
+		return -1;
+	}
+
 	if (ret != IKS_OK) {
 		return ret;
 	}