ACPI: thermal: Adjust critical.flags.valid check

It is not necessary to compare critical.flags.valid to 1 in
acpi_thermal_trips_update() and doing so is also inconsistent with
other similar checks in that code, so simply check if the flag is
not 0 instead.

No expected functional impact.
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>

drivers/acpi/thermal.c

@@ -291,7 +291,7 @@ static int acpi_thermal_trips_update(struct acpi_thermal *tz, int flag)
 					  "Found critical threshold [%lu]\n",
 					  tz->trips.critical.temperature);
 		}
-		if (tz->trips.critical.flags.valid == 1) {
+		if (tz->trips.critical.flags.valid) {
 			if (crt == -1) {
 				tz->trips.critical.flags.valid = 0;
 			} else if (crt > 0) {