greybus: camera: fix memory leak in configure-streams error path

Fix memory leak in configure-streams error path by making sure to
release the operation buffers before returning.

Signed-off-by: Johan Hovold <johan@hovoldconsulting.com>
Reviewed-by: Laurent Pinchart <laurent.pinchart@linaro.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@google.com>