[PATCH] fix inverted test in __skb_recv_datagram

[Rainer Weikusat]

As the kernel generally uses negated error numbers, *err needs to be
compared with -EAGAIN (d'oh).

Signed-off-by: Rainer Weikusat <rweiku...@mobileactivedefense.com>
Fixes: ea3793ee29d3
---
diff --git a/net/core/datagram.c b/net/core/datagram.c
index 7daff66..fa9dc64 100644
--- a/net/core/datagram.c
+++ b/net/core/datagram.c
@@ -275,7 +275,7 @@ struct sk_buff *__skb_recv_datagram(struct sock *sk, 
unsigned int flags,
                if (skb)
                        return skb;
 
-               if (*err != EAGAIN)
+               if (*err != -EAGAIN)
                        break;
        } while (timeo &&
                !__skb_wait_for_more_packets(sk, err, &timeo, last));

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