Turn 4 lines of code into 1 line that does the same thing.

git-svn-id: https://origsvn.digium.com/svn/asterisk/trunk@77538 65c4cc65-6c06-0410-ace0-fbb531ad65f3

channels/chan_sip.c

@@ -8974,10 +8974,7 @@ static void sip_peer_hold(struct sip_pvt *p, int hold)
 		return;
 
 	/* If they put someone on hold, increment the value... otherwise decrement it */
-	if (hold)
-		ast_atomic_fetchadd_int(&peer->onHold, +1);
-	else
-		ast_atomic_fetchadd_int(&peer->onHold, -1);
+	ast_atomic_fetchadd_int(&peer->onHold, (hold ? +1 : -1));
 
 	/* Request device state update */
 	ast_device_state_changed("SIP/%s", peer->name);