xen-netback: use correct index for invalidation in xen_netbk_tx_check_gop()

Signed-off-by: Jan Beulich <jbeulich@suse.com>
Signed-off-by: Ian Campbell <ian.campbell@citrix.com>
Cc: stable@vger.kernel.org
Signed-off-by: David S. Miller <davem@davemloft.net>
diff --git a/drivers/net/xen-netback/netback.c b/drivers/net/xen-netback/netback.c
index 0cb594c..1ae270e 100644
--- a/drivers/net/xen-netback/netback.c
+++ b/drivers/net/xen-netback/netback.c
@@ -1021,7 +1021,7 @@
 		pending_idx = *((u16 *)skb->data);
 		xen_netbk_idx_release(netbk, pending_idx);
 		for (j = start; j < i; j++) {
-			pending_idx = frag_get_pending_idx(&shinfo->frags[i]);
+			pending_idx = frag_get_pending_idx(&shinfo->frags[j]);
 			xen_netbk_idx_release(netbk, pending_idx);
 		}