[PATCH] md: clear the 'recovery' flags when starting an md array.

It's possible for this to still have flags in it and a previous instance
has been stopped, and that confused the new array using the same mddev.

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>