fs: mark nibblemap const

Signed-off-by: Philippe De Muyter <phdm@macqel.be>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
diff --git a/fs/minix/bitmap.c b/fs/minix/bitmap.c
index 99a12f1..703cc35 100644
--- a/fs/minix/bitmap.c
+++ b/fs/minix/bitmap.c
@@ -17,7 +17,7 @@
 #include <linux/bitops.h>
 #include <linux/sched.h>
 
-static int nibblemap[] = { 4,3,3,2,3,2,2,1,3,2,2,1,2,1,1,0 };
+static const int nibblemap[] = { 4,3,3,2,3,2,2,1,3,2,2,1,2,1,1,0 };
 
 static unsigned long count_free(struct buffer_head *map[], unsigned numblocks, __u32 numbits)
 {