blktap2: Invalid logic detecting unaligned buffers in vhd_write_block

blktap2: Invalid logic detecting unaligned buffers in vhd_write_block

It seems the logic is meant to detect sector unaligned buffers for block
writes. The NOTing of the logic instead masks off any unaligned bits and
also would cause the function to always fail. It seems the function is not
used in any of the tools so that is probably why the problem is not seen.
In the vhd_read_block function it is correct.

Signed-off-by: Ross Philipson <ross.philipson@ainfosec.com>
Acked-by: Wei Liu <wei.liu2@citrix.com>