REQ_PC is out of date, so replace it with passthrough IO.

Also remove the local variable of 'prev' since we can reuse
the top local variable of 'bvec'.

No function change.

Cc: Omar Sandoval <osandov@fb.com>
Cc: Christoph Hellwig <hch@lst.de>
Signed-off-by: NMing Lei <ming.lei@redhat.com>
Signed-off-by: NJens Axboe <axboe@kernel.dk>