MT#55283 fix possible null dereference

`local_ep` can end up as NULL. Don't try to send to Homer without it.

Change-Id: Ie4055034f60749f454feeb674cc080c8089ac913
Warned-by: Coverity

daemon/control_ng.c

@@ -552,7 +552,7 @@ static void homer_fill_values(ng_ctx *hctx, str *callid, int command) {
 }
 
 static void homer_trace_msg_in(ng_ctx *hctx, str *data) {
-	if (hctx) {
+	if (hctx && hctx->local_ep) {
 		hctx->should_trace = should_trace_msg(hctx->command);
 		if (hctx->should_trace)	{
 			struct timeval tv;