staging: vc04_services: bcm2835-camera: Modify return statement.

Modify return statement and remove the respective assignment.

Issue found by Coccinelle.

Signed-off-by: Vatsala Narang <vatsalanarang@gmail.com>
Acked-by: Stefan Wahren <stefan.wahren@i2se.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>