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: ca37818 ("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>

Author: Christoph Hellwig

fs/xfs/xfs_qm.c

@@ -1318,7 +1318,7 @@ xfs_qm_quotacheck_dqadjust(
 
 	error = xfs_dquot_attach_buf(NULL, dqp);
 	if (error)
-		return error;
+		goto out_unlock;
 
 	trace_xfs_dqadjust(dqp);
 
@@ -1348,8 +1348,9 @@ xfs_qm_quotacheck_dqadjust(
 	}
 
 	dqp->q_flags |= XFS_DQFLAG_DIRTY;
+out_unlock:
 	xfs_qm_dqput(dqp);
-	return 0;
+	return error;
 }
 
 /*