Ensure we don't pickup ourselves when doing pickup by exten.

(closes issue #15100)
Reported by: lmsteffan
Patches:
      (modified) pickup.patch uploaded by lmsteffan (license 779)



git-svn-id: https://origsvn.digium.com/svn/asterisk/branches/1.4@218223 65c4cc65-6c06-0410-ace0-fbb531ad65f3

apps/app_directed_pickup.c

@@ -98,7 +98,7 @@ static int pickup_by_exten(struct ast_channel *chan, char *exten, char *context)
 	while ((target = ast_channel_walk_locked(target))) {
 		if ((!strcasecmp(target->macroexten, exten) || !strcasecmp(target->exten, exten)) &&
 		    !strcasecmp(target->dialcontext, context) &&
-		    can_pickup(target)) {
+		    (chan != target) && can_pickup(target)) {
 			res = pickup_do(chan, target);
 			ast_channel_unlock(target);
 			break;