[PATCH 001 of 2] md: Fix an unsigned compare to allow creation of bitmaps with v1.0 metadata.

As page->index is unsigned, this all becomes an unsigned comparison, which
 almost always returns an error.

Signed-off-by: Neil Brown <redacted>
Cc: Stable <stable@kernel.org>

### Diffstat output
 ./drivers/md/bitmap.c |    2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff .prev/drivers/md/bitmap.c ./drivers/md/bitmap.c

--- .prev/drivers/md/bitmap.c	2007-10-22 16:55:48.000000000 +1000
+++ ./drivers/md/bitmap.c	2007-10-22 16:55:52.000000000 +1000

@@ -274,7 +274,7 @@ static int write_sb_page(struct bitmap *
 			if (bitmap->offset < 0) {
 				/* DATA  BITMAP METADATA  */
 				if (bitmap->offset
-				    + page->index * (PAGE_SIZE/512)
+				    + (long)(page->index * (PAGE_SIZE/512))
 				    + size/512 > 0)
 					/* bitmap runs in to metadata */
 					return -EINVAL;