target: avoid accessing .bi_vcnt directly
When the bio is full, bio_add_pc_page() will return zero, so use this information tell when the bio is full. Also replace access to .bi_vcnt for pr_debug() with bio_segments(). Reviewed-by: NChristoph Hellwig <hch@lst.de> Signed-off-by: NMing Lei <tom.leiming@gmail.com> Reviewed-by: NSagi Grimberg <sagi@grimberg.me> Signed-off-by: NJens Axboe <axboe@fb.com>
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