fs/ntfs3: Initialize pointer before use place in fill_super

Initializing should be as close as possible when we use it so that
we do not need to scroll up to see what is happening.

Also bdev_get_queue() can never return NULL so we do not need to check
for !rq.

Signed-off-by: Kari Argillander <kari.argillander@gmail.com>
Signed-off-by: Konstantin Komarov <almaz.alexandrovich@paragon-software.com>