ipv6: fib6_info_destroy_rcu() cleanup

We do not need to clear f6i->rt6i_exception_bucket right before
freeing f6i.

Note that f6i->rt6i_exception_bucket is properly protected by
f6i->exception_bucket_flushed being set to one in rt6_flush_exceptions()
under the protection of rt6_exception_lock.
Signed-off-by: NEric Dumazet <edumazet@google.com>
Cc: Wei Wang <weiwan@google.com>
Acked-by: NWei Wang <weiwan@google.com>
Reviewed-by: NDavid Ahern <dsahern@gmail.com>
Signed-off-by: NDavid S. Miller <davem@davemloft.net>

net/ipv6/ip6_fib.c

@@ -175,10 +175,7 @@ void fib6_info_destroy_rcu(struct rcu_head *head)
 	WARN_ON(f6i->fib6_node);
 
 	bucket = rcu_dereference_protected(f6i->rt6i_exception_bucket, 1);
-	if (bucket) {
-		f6i->rt6i_exception_bucket = NULL;
-		kfree(bucket);
-	}
+	kfree(bucket);
 
 	if (f6i->rt6i_pcpu) {
 		int cpu;