staging: vchiq_arm: Unify return code variable

The file vchiq_arm uses a wild mixture of variable names for
return codes. Unify them by using the common name "ret".

Signed-off-by: Stefan Wahren <wahrenst@gmx.net>
Reviewed-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
Link: https://lore.kernel.org/r/20240621131958.98208-2-wahrenst@gmx.net


Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>