staging: vc04_services: remove redundant assignment to pointer service

Pointer service is being set to NULL however this value is never
read and so the assignment is redundant and can be removed.

Addresses-Coverity: ("Unused value")
Signed-off-by: Colin Ian King <colin.king@canonical.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>