ext4: check the return value of ext4_xattr_inode_dec_ref()

[ Upstream commit 56d0d0b9 ]

Check the return value of ext4_xattr_inode_dec_ref(), which could
return error code and need to be warned.

Signed-off-by: Li Zhong <floridsleeves@gmail.com>
Link: https://lore.kernel.org/r/20220917002816.3804400-1-floridsleeves@gmail.com


Signed-off-by: Theodore Ts'o <tytso@mit.edu>
Stable-dep-of: 0a46ef23 ("ext4: do not create EA inode under buffer lock")
Signed-off-by: Sasha Levin <sashal@kernel.org>