staging: xgifb: check and report invalid option values

Check option values with kstrtoul(). This will also eliminate some
checkpatch warnings about simple_strtoul() usage.

Signed-off-by: Aaro Koskinen <aaro.koskinen@iki.fi>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
1 file changed