[PATCH] ll_merge_requests_fn() cleanup

ll_merge_requests_fn() assigns total_{phys,hw}_segments twice.  Fix this
and a typo.

Signed-off-by: Nikita Danilov <nikita@clusterfs.com>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>