drbd: drbd_send_short_cmd(): Return 0 upon success and an error code otherwise

Signed-off-by: Philipp Reisner <philipp.reisner@linbit.com>
Signed-off-by: Lars Ellenberg <lars.ellenberg@linbit.com>

drivers/block/drbd/drbd_int.h

@@ -1937,7 +1937,7 @@ static inline int drbd_send_short_cmd(struct drbd_conf *mdev,
 				      enum drbd_packet cmd)
 {
 	struct p_header h;
-	return !drbd_send_cmd(mdev, &mdev->tconn->data, cmd, &h, sizeof(h));
+	return drbd_send_cmd(mdev, &mdev->tconn->data, cmd, &h, sizeof(h));
 }
 
 static inline int drbd_send_ping(struct drbd_tconn *tconn)

drivers/block/drbd/drbd_worker.c

@@ -1227,7 +1227,7 @@ int w_send_write_hint(struct drbd_work *w, int cancel)
 	struct drbd_conf *mdev = w->mdev;
 	if (cancel)
 		return 1;
-	return drbd_send_short_cmd(mdev, P_UNPLUG_REMOTE);
+	return !drbd_send_short_cmd(mdev, P_UNPLUG_REMOTE);
 }
 
 int w_send_oos(struct drbd_work *w, int cancel)