Revert "Revert "block: nbd: add sanity check for first_minor""

stable inclusion
from stable-v5.10.170
commit f3f6b33b77bac0bd27f1f1bec05ab58a54948fc9
category: bugfix
bugzilla: https://gitee.com/openeuler/kernel/issues/I7V9QX

Reference: https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git/commit/?id=f3f6b33b77bac0bd27f1f1bec05ab58a54948fc9

----------------------------------------------------

This reverts commit 0daa75bf750c400af0a0127fae37cd959d36dee7.

These problems such as:
https://lore.kernel.org/all/CACPK8XfUWoOHr-0RwRoYoskia4fbAbZ7DYf5wWBnv6qUnGq18w@mail.gmail.com/


It was introduced by introduced by commit b1a81163 ("block: nbd: add sanity check for first_minor")
and has been have been fixed by commit e4c4871a ("nbd: fix max value for 'first_minor'").

Cc: Joel Stanley <joel@jms.id.au>
Cc: Christoph Hellwig <hch@lst.de>
Cc: Pavel Skripkin <paskripkin@gmail.com>
Cc: Jens Axboe <axboe@kernel.dk>
Cc: Sasha Levin <sashal@kernel.org>
Cc: stable@vger.kernel.org # v5.10+
Signed-off-by: Wen Yang <wenyang.linux@foxmail.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Signed-off-by: zhaoxiaoqiang11 <zhaoxiaoqiang11@jd.com>