JFS: use DIV_ROUND_UP where appropriate

This replaces some macros and code, which do the same thing as DIV_ROUND_UP
defined in kernel.h, to use the DIV_ROUND_UP macro.

Signed-off-by: Shaun Zinck <shaun.zinck@gmail.com>
Signed-off-by: Dave Kleikamp <shaggy@linux.vnet.ibm.com>
diff --git a/fs/jfs/jfs_dtree.h b/fs/jfs/jfs_dtree.h
index 8561c6e..cdac2d5 100644
--- a/fs/jfs/jfs_dtree.h
+++ b/fs/jfs/jfs_dtree.h
@@ -74,7 +74,7 @@
 #define DTIHDRDATALEN	11
 
 /* compute number of slots for entry */
-#define	NDTINTERNAL(klen) ( ((4 + (klen)) + (15 - 1)) / 15 )
+#define	NDTINTERNAL(klen) (DIV_ROUND_UP((4 + (klen)), 15))
 
 
 /*
@@ -133,7 +133,7 @@
 	( ((s64)((dts)->addr1)) << 32 | __le32_to_cpu((dts)->addr2) )
 
 /* compute number of slots for entry */
-#define	NDTLEAF_LEGACY(klen)	( ((2 + (klen)) + (15 - 1)) / 15 )
+#define	NDTLEAF_LEGACY(klen)	(DIV_ROUND_UP((2 + (klen)), 15))
 #define	NDTLEAF	NDTINTERNAL