net: ipv4: remove unnecessary check on orig_oif

rt_iif is going to be set to either 0 or orig_oif. If orig_oif
is 0 it amounts to the same end result so remove the check.
Signed-off-by: David Ahern <dsahern@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

net/ipv4/route.c

@@ -2236,7 +2236,7 @@ static struct rtable *__mkroute_output(const struct fib_result *res,
 	if (!rth)
 		return ERR_PTR(-ENOBUFS);
 
-	rth->rt_iif	= orig_oif ? : 0;
+	rth->rt_iif = orig_oif;
 	if (res->table)
 		rth->rt_table_id = res->table->tb_id;