Staging: keucr driver: fix uninitialized variable & proper memset length

There was commented out transfer_flags initialization.
And i think memset should fill entire structure, not only length of
pointer to it.

This makes the driver work properly now on my hardware.

Signed-off-by: Konstantin Katuev <kkatuev@gmail.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>