chan_sip: Delete unneeded check

P is always true. We check it before

Change-Id: Iee61cda002a9f61aee26b9f66c5f9b59e3389efb

channels/chan_sip.c

@@ -6887,10 +6887,9 @@ static int update_call_counter(struct sip_pvt *fup, int event)
 		ast_log(LOG_ERROR, "update_call_counter(%s, %d) called with no event!\n", name, event);
 	}
 
-	if (p) {
 	ast_devstate_changed(AST_DEVICE_UNKNOWN, AST_DEVSTATE_CACHABLE, "SIP/%s", p->name);
 	sip_unref_peer(p, "update_call_counter: sip_unref_peer from call counter");
-	}
+
 	return 0;
 }