leds: flash: Remove checking for state < 1 in flash_strobe_store()

Strobe state variable is declared as unsigned long, remove
the check for values less than zero then.

Signed-off-by: Jacek Anaszewski <[e-mail]>
Reported-by: David Binderman <[e-mail]>

drivers/leds/led-class-flash.c

···
 	if (ret)
 		goto unlock;
 
-	if (state < 0 || state > 1) {
+	if (state > 1) {
 		ret = -EINVAL;
 		goto unlock;
 	}