[PATCH] xfrm: fix error checking in xfrm_output_gso

["Yan, Zheng" <zheng.z.yan@intel.com>]

xfrm_output2() returns 1 on success. This bug makes xfrm_output_gso()
drop all segments except the first one.

Signed-off-by: Zheng Yan <zheng.z.yan@intel.com>
---
diff --git a/net/xfrm/xfrm_output.c b/net/xfrm/xfrm_output.c
index 47bacd8..04e963a 100644
--- a/net/xfrm/xfrm_output.c
+++ b/net/xfrm/xfrm_output.c
@@ -159,7 +159,7 @@ static int xfrm_output_gso(struct sk_buff *skb)
 		segs->next = NULL;
 		err = xfrm_output2(segs);
 
-		if (unlikely(err)) {
+		if (unlikely(err < 0)) {
 			while ((segs = nskb)) {
 				nskb = segs->next;
 				segs->next = NULL;