[PATCH v2] ipv6: esp6: use BUG_ON instead of if condition followed by BUG

[Gustavo A. R. Silva]

Use BUG_ON instead of if condition followed by BUG in esp_remove_trailer.

This issue was detected with the help of Coccinelle.

Signed-off-by: Gustavo A. R. Silva <garsi...@embeddedor.com>
---
Changes in v2:
 Update the code as suggested by Herbert Xu:

 ret = foo();
 BUG_ON(ret);

 net/ipv6/esp6.c | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/net/ipv6/esp6.c b/net/ipv6/esp6.c
index 89910e2..da1f6a6 100644
--- a/net/ipv6/esp6.c
+++ b/net/ipv6/esp6.c
@@ -483,8 +483,8 @@ static inline int esp_remove_trailer(struct sk_buff *skb)
                goto out;
        }
 
-       if (skb_copy_bits(skb, skb->len - alen - 2, nexthdr, 2))
-               BUG();
+       ret = skb_copy_bits(skb, skb->len - alen - 2, nexthdr, 2);
+       BUG_ON(ret);
 
        ret = -EINVAL;
        padlen = nexthdr[0];
-- 
2.7.4