dm-bufio: virt_to_phys() doesn't change remainder modulo PAGE_SIZE
... so virt_to_phys(p) & (PAGE_SIZE - 1) is a very odd way to
spell offset_in_page(p).
Signed-off-by: 
Al Viro <viro@zeniv.linux.org.uk>
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... so virt_to_phys(p) & (PAGE_SIZE - 1) is a very odd way to
spell offset_in_page(p).
Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>