platform/x86: samsung-laptop: Fix an unsigned comparison which can never be negative

Eliminate the follow smatch warnings:

drivers/platform/x86/samsung-laptop.c:1124 kbd_led_set() warn: unsigned
'value' is never less than zero.

Reported-by: Abaci Robot <abaci@linux.alibaba.com>
Signed-off-by: Jiapeng Chong <jiapeng.chong@linux.alibaba.com>
Link: https://lore.kernel.org/r/20220322061830.105579-1-jiapeng.chong@linux.alibaba.com


Reviewed-by: Hans de Goede <hdegoede@redhat.com>
Signed-off-by: Hans de Goede <hdegoede@redhat.com>