Description: fs: fix UAF/GPF bug in nilfs_mdt_destroy
References:
 https://lore.kernel.org/linux-fsdevel/20220816040859.659129-1-dzm91@hust.edu.cn/T/#u
Notes:
Bugs:
upstream: released (6.1-rc1) [2e488f13755ffbb60f307e991b27024716a33b29]
5.10-upstream-stable: released (5.10.148) [1e555c3ed1fce4b278aaebe18a64a934cece57d8]
4.19-upstream-stable: released (4.19.262) [ec2aab115eb38ac4992ea2fcc2a02fbe7af5cf48]
sid: released (6.0.2-1)
5.10-bullseye-security: released (5.10.148-1)
4.19-buster-security: released (4.19.269-1)