ACPI: platform_profile: Improve platform_profile_unregister()

ACPI: platform_profile: Improve platform_profile_unregister()

Drivers usually call this method on error/exit paths and do not check
for it's return value, which is always 0 anyway, so make it void.

This is safe to do as currently all drivers use
devm_platform_profile_register().

While at it, improve the style and make the function safer by checking
for IS_ERR_OR_NULL before dereferencing the device pointer.

Signed-off-by: Kurt Borja <kuurtb@gmail.com>
Reviewed-by: Mark Pearson <mpearson-lenovo@squebb.ca>
Link: https://patch.msgid.link/20250212190308.21209-1-kuurtb@gmail.com
[ rjw: Minor changelog edits ]
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>