fuse: cleanup fuse_wait_on_page_writeback

fuse_wait_on_page_writeback() always returns zero and nobody cares.
Let's make it void.

Signed-off-by: Maxim Patlasov <mpatlasov@virtuozzo.com>
Signed-off-by: Vasily Averin <vvs@virtuozzo.com>
Signed-off-by: Miklos Szeredi <mszeredi@redhat.com>