staging: vc04_services: bcm2835-camera: Compress two lines into one line

Return value directly without saving it in a variable and remove that
variable.

Issue suggested by Coccinelle.

Signed-off-by: Vatsala Narang <vatsalanarang@gmail.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>