xfs: Change xfs_dquot_acct to be a 2-dimensional array

In preparation for combined pquota/gquota support, for the sake
of readability, change xfs_dquot_acct to be a 2-dimensional array.

Signed-off-by: Chandra Seetharaman <sekharan@us.ibm.com>
Reviewed-by: Ben Myers <bpm@sgi.com>
Signed-off-by: Ben Myers <bpm@sgi.com>

diff --git a/fs/xfs/xfs_qm.h b/fs/xfs/xfs_qm.h
index 978bbb1..bdb4f8b 100644
--- a/fs/xfs/xfs_qm.h
+++ b/fs/xfs/xfs_qm.h
@@ -116,11 +116,15 @@
  * to do at commit time. All transactions that we know of at this point
  * affect no more than two dquots of one type. Hence, the TRANS_MAXDQS value.
  */
+enum {
+	XFS_QM_TRANS_USR = 0,
+	XFS_QM_TRANS_GRP,
+	XFS_QM_TRANS_DQTYPES
+};
 #define XFS_QM_TRANS_MAXDQS		2
-typedef struct xfs_dquot_acct {
-	xfs_dqtrx_t	dqa_usrdquots[XFS_QM_TRANS_MAXDQS];
-	xfs_dqtrx_t	dqa_grpdquots[XFS_QM_TRANS_MAXDQS];
-} xfs_dquot_acct_t;
+struct xfs_dquot_acct {
+	struct xfs_dqtrx	dqs[XFS_QM_TRANS_DQTYPES][XFS_QM_TRANS_MAXDQS];
+};
 
 /*
  * Users are allowed to have a usage exceeding their softlimit for