staging: vc04_services: Remove unnecessary casts.

Explicit type casting of variable, with same type as
that of variable, is not required.
Issue found using coccinelle.

Signed-off-by: Sanjana Sanikommu <sanjana99reddy99@gmail.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>