ext4: fix to check return value of freeze_bdev() in ext4_shutdown()
[ Upstream commit c4d13222 ] freeze_bdev() can fail due to a lot of reasons, it needs to check its reason before later process. Fixes: 783d9485 ("ext4: add EXT4_IOC_GOINGDOWN ioctl") Cc: stable@kernel.org Signed-off-by: Chao Yu <chao@kernel.org> Link: https://lore.kernel.org/r/20230606073203.1310389-1-chao@kernel.org Signed-off-by: Theodore Ts'o <tytso@mit.edu> Signed-off-by: Sasha Levin <sashal@kernel.org>
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