After validation check, the 'checksum' is not written back
to footer, which leave it with zero.

This results in errors while loadding it under Microsoft's
Hyper-V environment, and also errors from utilities like
Citrix's vhd-util.
Signed-off-by: NZhang Shengju <sean_zhang@trendmicro.com.cn>
Signed-off-by: NKevin Wolf <kwolf@redhat.com>