xfs: replace open-coded XFS_ICI_NO_TAG

Use XFS_ICI_NO_TAG instead of -1 when appropriate.
Signed-off-by: Darrick J. Wong <darrick.wong@oracle.com>
Reviewed-by: Christoph Hellwig <hch@lst.de>
Reviewed-by: Brian Foster <bfoster@redhat.com>

fs/xfs/xfs_icache.c

@@ -835,7 +835,7 @@ xfs_inode_ag_walk(
 
 		rcu_read_lock();
 
-		if (tag == -1)
+		if (tag == XFS_ICI_NO_TAG)
 			nr_found = radix_tree_gang_lookup(&pag->pag_ici_root,
 					(void **)batch, first_index,
 					XFS_LOOKUP_BATCH);
@@ -993,8 +993,8 @@ xfs_inode_ag_iterator_flags(
 	ag = 0;
 	while ((pag = xfs_perag_get(mp, ag))) {
 		ag = pag->pag_agno + 1;
-		error = xfs_inode_ag_walk(mp, pag, execute, flags, args, -1,
-					  iter_flags);
+		error = xfs_inode_ag_walk(mp, pag, execute, flags, args,
+				XFS_ICI_NO_TAG, iter_flags);
 		xfs_perag_put(pag);
 		if (error) {
 			last_error = error;