[IPV6]: Use BUG_ON instead of if + BUG in fib6_del_route.

Signed-off-by: Pavel Emelyanov <xemul@openvz.org>
Signed-off-by: David S. Miller <davem@davemloft.net>
diff --git a/net/ipv6/ip6_fib.c b/net/ipv6/ip6_fib.c
index f93407c..bab72b6 100644
--- a/net/ipv6/ip6_fib.c
+++ b/net/ipv6/ip6_fib.c
@@ -1151,7 +1151,7 @@
 			fn = fn->parent;
 		}
 		/* No more references are possible at this point. */
-		if (atomic_read(&rt->rt6i_ref) != 1) BUG();
+		BUG_ON(atomic_read(&rt->rt6i_ref) != 1);
 	}
 
 	inet6_rt_notify(RTM_DELROUTE, rt, info);