acer-wmi: Fix backlight on AMW0 (V1) laptops

There is some leftover cruft from the old quirk infrastructure that causes
us to be unable to set the backlight on older laptops.

Signed-off-by: Carlos Corbacho <carlos@strangeworlds.co.uk>
Signed-off-by: Len Brown <len.brown@intel.com>
diff --git a/drivers/misc/acer-wmi.c b/drivers/misc/acer-wmi.c
index a4d6775..d7aea93 100644
--- a/drivers/misc/acer-wmi.c
+++ b/drivers/misc/acer-wmi.c
@@ -428,11 +428,9 @@
 		if (value > max_brightness)
 			return AE_BAD_PARAMETER;
 		switch (quirks->brightness) {
-		case 1:
-			return ec_write(0x83, value);
 		default:
-			return AE_BAD_ADDRESS;
-		break;
+			return ec_write(0x83, value);
+			break;
 		}
 	default:
 		return AE_BAD_ADDRESS;