NFC: digital: Free supervisor PDUs

This patch frees the RTOX resp sk_buff in initiator mode. It also makes
use of the free_resp exit point for ATN supervisor PDUs in both
initiator and target mode.

Signed-off-by: Thierry Escande <[e-mail]>
Signed-off-by: Samuel Ortiz <[e-mail]>

net/nfc/digital_dep.c

···
 			if (rc)
 				goto error;
 
-			return;
+			goto free_resp;
 		}
 
 		rc = digital_in_send_rtox(ddev, data_exch, resp->data[0]);
 		if (rc)
 			goto error;
 
-		kfree_skb(resp);
-		return;
+		goto free_resp;
 	}
 
 exit:
···
 
 		ddev->atn_count++;
 
-		kfree_skb(resp);
-		return;
+		goto free_resp;
 	}
 
 	rc = nfc_tm_data_received(ddev->nfc_dev, resp);