decnet: remove some pointless conditionals before kfree_skb()

Remove some pointless conditionals before kfree_skb().

Signed-off-by: Wei Yongjun <yjwei@cn.fujitsu.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
diff --git a/net/decnet/af_decnet.c b/net/decnet/af_decnet.c
index 12bf7d4..963da86 100644
--- a/net/decnet/af_decnet.c
+++ b/net/decnet/af_decnet.c
@@ -2071,8 +2071,7 @@
 	}
 out:
 
-	if (skb)
-		kfree_skb(skb);
+	kfree_skb(skb);
 
 	release_sock(sk);