xfs: don't leak a locked dquot when xfs_dquot_attach_buf fails

xfs: don't leak a locked dquot when xfs_dquot_attach_buf fails

xfs_qm_quotacheck_dqadjust acquired the dquot through xfs_qm_dqget,
which means it owns a reference and holds q_qlock.  Both need to
be dropped on an error exit.

Cc: <stable@vger.kernel.org> # v6.13
Fixes: ca378189fdfa ("xfs: convert quotacheck to attach dquot buffers")
Reported-by: kernel test robot <lkp@intel.com>
Reported-by: Dan Carpenter <dan.carpenter@linaro.org>
Signed-off-by: Christoph Hellwig <hch@lst.de>
Reviewed-by: Darrick J. Wong <djwong@kernel.org>
Signed-off-by: Carlos Maiolino <cem@kernel.org>