generic: test for failure to unlock inode after chgrp fails with EDQUOT
This is a regression test that checks for xfs drivers that fail to
unlock the inode after changing the group id fails with EDQUOT. It
pairs with "xfs: fix missing ILOCK unlock when xfs_setattr_nonsize fails
due to EDQUOT".
Signed-off-by: Darrick J. Wong <darrick.wong@oracle.com> Reviewed-by: Christoph Hellwig <hch@lst.de> Signed-off-by: Eryu Guan <guaneryu@gmail.com>