block: remove bvec_to_phys
We only use it in biovec_phys_mergeable and a m68k paravirt driver, so just opencode it there. Also remove the pointless unsigned long cast for the offset in the opencoded instances. Signed-off-by: NChristoph Hellwig <hch@lst.de> Reviewed-by: NGeert Uytterhoeven <geert@linux-m68k.org> Signed-off-by: NJens Axboe <axboe@kernel.dk>
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