net/ax25: Use available error codes

Author: Julia Lawall <julia@diku.dk>

Error codes are stored in err, but the return value is always 0.  Return
err instead.

The semantic match that finds this problem is as follows:
(http://coccinelle.lip6.fr/)

// 
@r@
local idexpression x;
constant C;
@@

if (...) { ...
  x = -C
  ... when != x
(
  return <+...x...+>;
|
  return NULL;
|
  return;
|
* return ...;
)
}
// 

Signed-off-by: Julia Lawall 
Acked-by: Ralf Baechle 
Signed-off-by: David S. Miller 

---
 net/ax25/af_ax25.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)
 
diff --git a/net/ax25/af_ax25.c b/net/ax25/af_ax25.c
index cfdfd7e..26eaebf 100644
--- a/net/ax25/af_ax25.c
+++ b/net/ax25/af_ax25.c
@@ -1103,7 +1103,7 @@ done:
 out:
 	release_sock(sk);
 
-	return 0;
+	return err;
 }
 
 /*