fs/gfs2: remove unused IS_DINODE and IS_LEAF macros

Since commit 1579343a ("GFS2: Remove dirent_first() function"),
these macros aren't used any more, so remove them.
Signed-off-by: Alex Shi <alex.shi@linux.alibaba.com>
Signed-off-by: Andreas Gruenbacher <agruenba@redhat.com>

fs/gfs2/dir.c

@@ -73,9 +73,6 @@
 #include "bmap.h"
 #include "util.h"
 
-#define IS_LEAF     1 /* Hashed (leaf) directory */
-#define IS_DINODE   2 /* Linear (stuffed dinode block) directory */
-
 #define MAX_RA_BLOCKS 32 /* max read-ahead blocks */
 
 #define gfs2_disk_hash2offset(h) (((u64)(h)) >> 1)