NFC: pn533: fix error return code

Author: Julia Lawall <Julia.Lawall@lip6.fr>

Return a negative error code on failure.

A simplified version of the semantic match that finds this problem is as
follows: (http://coccinelle.lip6.fr/)

// 
@@
identifier ret; expression e1,e2;
@@
(
if (\(ret < 0\|ret != 0\))
 { ... return ret; }
|
ret = 0
)
... when != ret = e1
    when != &ret
*if(...)
{
  ... when != ret = e2
      when forall
 return ret;
}
// 

Signed-off-by: Julia Lawall 
Signed-off-by: Samuel Ortiz 

---
 drivers/nfc/pn533.c | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)
 
diff --git a/drivers/nfc/pn533.c b/drivers/nfc/pn533.c
index d46a700a..732e607 100644
--- a/drivers/nfc/pn533.c
+++ b/drivers/nfc/pn533.c
@@ -2554,8 +2554,10 @@ static int pn533_data_exchange_complete(struct pn533 *dev, void *_arg,
 	}
 
 	skb = pn533_build_response(dev);
-	if (!skb)
+	if (!skb) {
+		rc = -ENOMEM;
 		goto error;
+	}
 
 	arg->cb(arg->cb_context, skb, 0);
 	kfree(arg);