scsi: libfc: Free skb in fc_disc_gpn_id_resp() for valid cases

In fc_disc_gpn_id_resp(), skb is supposed to get freed in all cases except
for PTR_ERR. However, in some cases it didn't.

This fix is to call fc_frame_free(fp) before function returns.

Link: https://lore.kernel.org/r/[e-mail]
Reviewed-by: Girish Basrur <[e-mail]>
Reviewed-by: Santosh Vernekar <[e-mail]>
Reviewed-by: Saurav Kashyap <[e-mail]>
Reviewed-by: Shyam Sundar <[e-mail]>
Signed-off-by: Javed Hasan <[e-mail]>
Signed-off-by: Martin K. Petersen <[e-mail]>

drivers/scsi/libfc/fc_disc.c

···
 
 	if (PTR_ERR(fp) == -FC_EX_CLOSED)
 		goto out;
-	if (IS_ERR(fp))
-		goto redisc;
+	if (IS_ERR(fp)) {
+		mutex_lock(&disc->disc_mutex);
+		fc_disc_restart(disc);
+		mutex_unlock(&disc->disc_mutex);
+		goto out;
+	}
 
 	cp = fc_frame_payload_get(fp, sizeof(*cp));
 	if (!cp)
···
 				new_rdata->disc_id = disc->disc_id;
 				fc_rport_login(new_rdata);
 			}
-			goto out;
+			goto free_fp;
 		}
 		rdata->disc_id = disc->disc_id;
 		mutex_unlock(&rdata->rp_mutex);
···
 		fc_disc_restart(disc);
 		mutex_unlock(&disc->disc_mutex);
 	}
+free_fp:
+	fc_frame_free(fp);
 out:
 	kref_put(&rdata->kref, fc_rport_destroy);
 	if (!IS_ERR(fp))