ACPI: thermal: Use white space more consistently

The usage of white space in the ACPI thermal driver is not very
consistent, so improve that a bit.

While at it, add missing braces to if()/else in a few places.

No functional impact.

Signed-off-by: Rafael J. Wysocki <[email protected]>
Acked-by: Daniel Lezcano <[email protected]>

Author: rafaeljw