drivers/atm/atmtcp.c: fix error return code

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

Convert a zero return value on error to a negative one, as returned
elsewhere in the function.

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 
Acked-by: Chas Williams 
Signed-off-by: David S. Miller 

---
 drivers/atm/atmtcp.c | 1 +
 1 file changed, 1 insertion(+)
 
diff --git a/drivers/atm/atmtcp.c b/drivers/atm/atmtcp.c
index 0e3f8f9..480fa6f 100644
--- a/drivers/atm/atmtcp.c
+++ b/drivers/atm/atmtcp.c
@@ -299,6 +299,7 @@ static int atmtcp_c_send(struct atm_vcc *vcc,struct sk_buff *skb)
 	out_vcc = find_vcc(dev, ntohs(hdr->vpi), ntohs(hdr->vci));
 	read_unlock(&vcc_sklist_lock);
 	if (!out_vcc) {
+		result = -EUNATCH;
 		atomic_inc(&vcc->stats->tx_err);
 		goto done;
 	}