connector: remove duplicated code in cn_call_callback()

There were a couple of patches fixing the same bug that
results in duplicated err = 0; assignment.
The patch removes one of them.

Signed-off-by: Alexey Khoroshilov <khoroshilov@ispras.ru>
Signed-off-by: David S. Miller <davem@davemloft.net>
diff --git a/drivers/connector/connector.c b/drivers/connector/connector.c
index a36749f..9b0ea0a 100644
--- a/drivers/connector/connector.c
+++ b/drivers/connector/connector.c
@@ -139,7 +139,6 @@
 	spin_unlock_bh(&dev->cbdev->queue_lock);
 
 	if (cbq != NULL) {
-		err = 0;
 		cbq->callback(msg, nsp);
 		kfree_skb(skb);
 		cn_queue_release_callback(cbq);