thermal: intel: int340x: Assorted minor cleanups

Improve some inconsistent usage of white space in int340x_thermal_zone.c,
fix up one coding style issue in it (missing braces around an else
branch of a conditional) and while at it replace a !ACPI_FAILURE()
check with an equivalent ACPI_SUCCESS() one.

No intentional functional impact.

Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
Acked-by: Daniel Lezcano <daniel.lezcano@linaro.org>
Tested-by: Zhang Rui <rui.zhang@intel.com>
Reviewed-by: Zhang Rui <rui.zhang@intel.com>