net,rcu: convert call_rcu(fc_rport_free_rcu) to kfree_rcu()

The rcu callback fc_rport_free_rcu() just calls a kfree(),
so we use kfree_rcu() instead of the call_rcu(fc_rport_free_rcu).
Signed-off-by: Lai Jiangshan <laijs@cn.fujitsu.com>
Acked-by: David S. Miller <davem@davemloft.net>
Signed-off-by: Paul E. McKenney <paulmck@linux.vnet.ibm.com>
Reviewed-by: Josh Triplett <josh@joshtriplett.org>

net/ipv4/fib_semantics.c

@@ -141,18 +141,8 @@ const struct fib_prop fib_props[RTN_MAX + 1] = {
 	},
 };
 
-
 /* Release a nexthop info record */
 
-static void free_fib_info_rcu(struct rcu_head *head)
-{
-	struct fib_info *fi = container_of(head, struct fib_info, rcu);
-
-	if (fi->fib_metrics != (u32 *) dst_default_metrics)
-		kfree(fi->fib_metrics);
-	kfree(fi);
-}
-
 void free_fib_info(struct fib_info *fi)
 {
 	if (fi->fib_dead == 0) {
@@ -166,7 +156,7 @@ void free_fib_info(struct fib_info *fi)
 	} endfor_nexthops(fi);
 	fib_info_cnt--;
 	release_net(fi->fib_net);
-	call_rcu(&fi->rcu, free_fib_info_rcu);
+	kfree_rcu(fi, rcu);
 }
 
 void fib_release_info(struct fib_info *fi)