Don't subscribe to a mailbox on pseudo channels. It is futile. This solves an issue where duplicated pseudo channels would cause a crash because the first one would unsubscribe and the next one would also try to unsubscribe the same subscription.

(closes issue #14322)
Reported by: amessina


git-svn-id: https://origsvn.digium.com/svn/asterisk/trunk@174041 65c4cc65-6c06-0410-ace0-fbb531ad65f3

channels/chan_dahdi.c

@@ -9383,7 +9383,7 @@ static struct dahdi_pvt *mkintf(int channel, const struct dahdi_chan_conf *conf,
 		tmp->cid_ton = 0;
 		ast_copy_string(tmp->cid_name, conf->chan.cid_name, sizeof(tmp->cid_name));
 		ast_copy_string(tmp->mailbox, conf->chan.mailbox, sizeof(tmp->mailbox));
-		if (!ast_strlen_zero(tmp->mailbox)) {
+		if (channel != CHAN_PSEUDO && !ast_strlen_zero(tmp->mailbox)) {
 			char *mailbox, *context;
 			mailbox = context = ast_strdupa(tmp->mailbox);
 			strsep(&context, "@");