rbd: fix type of snap_id in rbd_dev_v2_snap_info()

The type of the snap_id local variable is defined with the
wrong byte order.  Fix that.
Signed-off-by: NAlex Elder <elder@inktank.com>
Reviewed-by: NJosh Durgin <josh.durgin@inktank.com>

drivers/block/rbd.c

@@ -2802,7 +2802,7 @@ static char *rbd_dev_v2_snap_name(struct rbd_device *rbd_dev, u32 which)
 static char *rbd_dev_v2_snap_info(struct rbd_device *rbd_dev, u32 which,
 		u64 *snap_size, u64 *snap_features)
 {
-	__le64 snap_id;
+	u64 snap_id;
 	u8 order;
 	int ret;