nbd: Fix 32-bit compilation on BLOCK_STATUS
iotests 123 and 209 fail on 32-bit platforms. The culprit:
sizeof(extent) is wrong; we want sizeof(*extent). But since
the struct is 8 bytes, it happened to work on 64-bit platforms
where the pointer is also 8 bytes (nasty).
Fixes:
78a33ab58
Reported-by: Max Reitz <mreitz@redhat.com>
Signed-off-by: Eric Blake <eblake@redhat.com>
Message-Id: <
20180327210517.
1804242-1-eblake@redhat.com>
Reviewed-by: Paolo Bonzini <pbonzini@redhat.com>
Reviewed-by: Vladimir Sementsov-Ogievskiy <vsementsov@virtuozzo.com>