bfq: Remove bfq_requeue_request_body()

The function has only a single caller and two lines. Just remove it
since it is pointless and just harming readability.

Signed-off-by: Jan Kara <jack@suse.cz>
Link: https://lore.kernel.org/r/20220519105235.31397-4-jack@suse.cz


Signed-off-by: Jens Axboe <axboe@kernel.dk>