staging: xgifb: vb_setmode: adjust descendant indentation to right

Adjust descendant indentation so that it is placed substantially to the
right. This change improves code readability and complies with the
Linux kernel coding style.

Signed-off-by: Kimberly Brown <kimbrownkd@gmail.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>