[PATCH] ipv4/route: avoid unused-but-set-variable warning

From: Arnd Bergmann <arnd@arndb.de>

The log_martians variable is only used in an #ifdef, causing a 'make W=1'
warning with gcc:

net/ipv4/route.c: In function 'ip_rt_send_redirect':
net/ipv4/route.c:880:13: error: variable 'log_martians' set but not used [-Werror=unused-but-set-variable]

Change the #ifdef to an equivalent IS_ENABLED() to let the compiler
see where the variable is used.

Fixes: 30038fc61adf ("net: ip_rt_send_redirect() optimization")
Signed-off-by: Arnd Bergmann <arnd@arndb.de>
---
 net/ipv4/route.c | 4 +---
 1 file changed, 1 insertion(+), 3 deletions(-)

diff --git a/net/ipv4/route.c b/net/ipv4/route.c
index c8f76f56dc16..d36ace160d42 100644
--- a/net/ipv4/route.c
+++ b/net/ipv4/route.c

@@ -926,13 +926,11 @@ void ip_rt_send_redirect(struct sk_buff *skb)
 		icmp_send(skb, ICMP_REDIRECT, ICMP_REDIR_HOST, gw);
 		peer->rate_last = jiffies;
 		++peer->n_redirects;
-#ifdef CONFIG_IP_ROUTE_VERBOSE
-		if (log_martians &&
+		if (IS_ENABLED(CONFIG_IP_ROUTE_VERBOSE) && log_martians &&
 		    peer->n_redirects == ip_rt_redirect_number)
 			net_warn_ratelimited("host %pI4/if%d ignores redirects for %pI4 to %pI4\n",
 					     &ip_hdr(skb)->saddr, inet_iif(skb),
 					     &ip_hdr(skb)->daddr, &gw);
-#endif
 	}
 out_put_peer:
 	inet_putpeer(peer);

-- 
2.39.2