acpi: Make sure valid CPU is passed to do_pm_op()

acpi: Make sure valid CPU is passed to do_pm_op()

Passing invalid CPU value to do_pm_op() will cause assertion
in cpu_online().

Signed-off-by: Boris Ostrovsky <boris.ostrovsky@amd.com>
Such checks would, at a first glance, then also be missing at the top
of various helper functions, but these check really were already
redundant with the check in do_pm_op(). Remove the redundant checks
for clarity and brevity.

Signed-off-by: Jan Beulich <jbeulich@suse.com>
Committed-by: Jan Beulich <jbeulich@suse.com>