xfs: turn the xfs_trans_mod_dquot_byino stub into an inline function

Without this upcoming change can cause an unused variable warning,
when adding a local variable for the fields field passed to it.

Signed-off-by: Christoph Hellwig <hch@lst.de>
Reviewed-by: "Darrick J. Wong" <djwong@kernel.org>
Signed-off-by: Chandan Babu R <chandanbabu@kernel.org>

Author: Christoph Hellwig

fs/xfs/xfs_quota.h

@@ -127,7 +127,10 @@ xfs_qm_vop_dqalloc(struct xfs_inode *ip, kuid_t kuid, kgid_t kgid,
 }
 #define xfs_trans_dup_dqinfo(tp, tp2)
 #define xfs_trans_free_dqinfo(tp)
-#define xfs_trans_mod_dquot_byino(tp, ip, fields, delta) do { } while (0)
+static inline void xfs_trans_mod_dquot_byino(struct xfs_trans *tp,
+		struct xfs_inode *ip, uint field, int64_t delta)
+{
+}
 #define xfs_trans_apply_dquot_deltas(tp)
 #define xfs_trans_unreserve_and_mod_dquots(tp)
 static inline int xfs_trans_reserve_quota_nblks(struct xfs_trans *tp,