a few cleanups to prepare for multipage bio_vecs

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To: Jens Axboe <axboe@xxxxxxxxx>, Ming Lei <ming.lei@xxxxxxxxxx>
Subject: a few cleanups to prepare for multipage bio_vecs
From: Christoph Hellwig <hch@xxxxxx>
Date: Mon, 4 Jun 2018 15:58:50 +0200
Cc: linux-block@xxxxxxxxxxxxxxx

Clean up some bio_vec abuses to prepare for saner handling of multipage
bio_vecs.

Follow-Ups:
- [PATCH 3/3] block: use bio_add_page in bio_iov_iter_get_pages
  - From: Christoph Hellwig
- [PATCH 2/3] block: bio_set_pages_dirty can't see NULL bv_page in a valid bio_vec
  - From: Christoph Hellwig
- [PATCH 1/3] block: simplify bio_check_pages_dirty
  - From: Christoph Hellwig

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