Make sure members are properly initialized.
Make sure members are properly initialized.

Without constructor, the trivial types such as integers and
pointers have undefined values.

Signed-off-by: Henner Zeller <259ad50fabbfd39355f36ecd6c0afca541ea66ef@acm.org>

chipsalliance/UHDM,chipsalliance/UHDM,chipsalliance/UHDM