The meaning of mddev->in_sync changed subtly a while ago, and raid1 wasn't
changed to match.  This results in raid1 read_balancing not working
properly.  This patch corrects the relevant test.
Signed-off-by: Neil Brown <neilb@cse.unsw.edu.au>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>