Staging: vc04_services: Cleanup in ctrl_set_bitrate()

Remove unnecessary variable from the function and make a corresponding
change w.r.t the variable. In addition to that align the parameters in
the parentheses to maintain Linux kernel coding style

Issue suggested by Coccinelle.

Signed-off-by: Madhumitha Prabakaran <madhumithabiw@gmail.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>