Merge patch series "sb_min_blocksize() fixes"

Enforce checking of sb_min_blocksize() calls and update all callers
accordingly.

* patches from https://patch.msgid.link/20251104125009.2111925-2-yangyongpeng.storage@gmail.com:
  block: add __must_check attribute to sb_min_blocksize()
  xfs: check the return value of sb_min_blocksize() in xfs_fs_fill_super
  isofs: check the return value of sb_min_blocksize() in isofs_fill_super
  exfat: check return value of sb_min_blocksize in exfat_read_boot_sector
  vfat: fix missing sb_min_blocksize() return value checks

Link: https://patch.msgid.link/20251104125009.2111925-2-yangyongpeng.storage@gmail.com
Signed-off-by: Christian Brauner <brauner@kernel.org>