xfs: clean up long conditionals in xfs_iwalk_ichunk_ra

Refactor xfs_iwalk_ichunk_ra to avoid long conditionals.
Signed-off-by: Darrick J. Wong <darrick.wong@oracle.com>
Reviewed-by: Brian Foster <bfoster@redhat.com>

fs/xfs/xfs_iwalk.c

@@ -83,16 +83,16 @@ xfs_iwalk_ichunk_ra(
 	agbno = XFS_AGINO_TO_AGBNO(mp, irec->ir_startino);
 
 	blk_start_plug(&plug);
-	for (i = 0;
-	     i < XFS_INODES_PER_CHUNK;
-	     i += igeo->inodes_per_cluster,
-			agbno += igeo->blocks_per_cluster) {
-		if (xfs_inobt_maskn(i, igeo->inodes_per_cluster) &
-		    ~irec->ir_free) {
+	for (i = 0; i < XFS_INODES_PER_CHUNK; i += igeo->inodes_per_cluster) {
+		xfs_inofree_t	imask;
+
+		imask = xfs_inobt_maskn(i, igeo->inodes_per_cluster);
+		if (imask & ~irec->ir_free) {
 			xfs_btree_reada_bufs(mp, agno, agbno,
 					igeo->blocks_per_cluster,
 					&xfs_inode_buf_ops);
 		}
+		agbno += igeo->blocks_per_cluster;
 	}
 	blk_finish_plug(&plug);
 }