Also unlock the "other" channel, when returning, due to glare.

(closes issue #15787)
 Reported by: tim_ringenbach
 Patches: 
       chan_local.diff uploaded by tim ringenbach (license 540)
 Tested by: tim_ringenbach


git-svn-id: https://origsvn.digium.com/svn/asterisk/branches/1.4@214940 65c4cc65-6c06-0410-ace0-fbb531ad65f3

channels/chan_local.c

@@ -204,6 +204,9 @@ static int local_queue_frame(struct local_pvt *p, int isoutbound, struct ast_fra
 		return and destroy p.  */
 		ast_mutex_unlock(&p->lock);
 		p = local_pvt_destroy(p);
+		if (other) {
+			ast_channel_unlock(other);
+		}
 		return -1;
 	}