fixes an error in r203638 CEL commit

(closes issue #15525)
Reported by: elguero
Patches:
      iax2-double-unlock.patch uploaded by elguero (license 37)
      15525.diff uploaded by dvossel (license 671)
Tested by: dvossel



git-svn-id: https://origsvn.digium.com/svn/asterisk/trunk@207225 65c4cc65-6c06-0410-ace0-fbb531ad65f3

channels/chan_iax2.c

@@ -8523,8 +8523,7 @@ static void set_hangup_source_and_cause(int callno, unsigned char causecode)
 	do {
 		if (ast_channel_trylock(iaxs[callno]->owner)) {
 			DEADLOCK_AVOIDANCE(&iaxsl[callno]);
-		}
-		else {
+		} else {
 			locked = 1;
 			owner = iaxs[callno]->owner;
 		}
@@ -8537,13 +8536,11 @@ static void set_hangup_source_and_cause(int callno, unsigned char causecode)
 		}
 		ast_set_hangupsource(iaxs[callno]->owner, iaxs[callno]->owner->name, 0);
 		ast_channel_unlock(owner);
-	}
-	if (locked) {
+	} else if(locked) {
 		ast_channel_unlock(owner);
 	}
 }
 
-
 static int socket_process(struct iax2_thread *thread)
 {
 	struct sockaddr_in sin;