xfrm: Fix the gc threshold value for ipv4

The xfrm gc threshold value depends on ip_rt_max_size. This
value was set to INT_MAX with the routing cache removal patch,
so we start doing garbage collecting when we have INT_MAX/2
IPsec routes cached. Fix this by going back to the static
threshold of 1024 routes.

Signed-off-by: Steffen Klassert <steffen.klassert@secunet.com>

net/ipv4/route.c

@@ -2597,7 +2597,7 @@ int __init ip_rt_init(void)
 		pr_err("Unable to create route proc files\n");
 #ifdef CONFIG_XFRM
 	xfrm_init();
-	xfrm4_init(ip_rt_max_size);
+	xfrm4_init();
 #endif
 	rtnl_register(PF_INET, RTM_GETROUTE, inet_rtm_getroute, NULL, NULL);