staging: vt6656: remove a useless call to memset().

This call is followed by a call to memcpy() on the same memory area, so it can
be safely removed.

Signed-off-by: Cyril Roelandt <tipecaml@gmail.com>
Acked-by: Marcos Paulo de Souza <marcos.souza.org@gmail.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>