PM / hibernate: re-enable nonboot cpus on disable_nonboot_cpus() failure

When disable_nonboot_cpus() fails on some cpu it doesn't bring back all
cpus it managed to offline, a consequent call to enable_nonboot_cpus() is
expected. In hibernation_platform_enter() we don't call
enable_nonboot_cpus() on error so cpus stay offlined.

create_image() and resume_target_kernel() functions handle
disable_nonboot_cpus() faults correctly, hibernation_platform_enter()
is the only one which is doing it wrong.
Signed-off-by: Vitaly Kuznetsov <vkuznets@redhat.com>
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>

kernel/power/hibernate.c

@@ -552,7 +552,7 @@ int hibernation_platform_enter(void)
 
 	error = disable_nonboot_cpus();
 	if (error)
-		goto Platform_finish;
+		goto Enable_cpus;
 
 	local_irq_disable();
 	syscore_suspend();
@@ -568,6 +568,8 @@ int hibernation_platform_enter(void)
  Power_up:
 	syscore_resume();
 	local_irq_enable();
+
+ Enable_cpus:
 	enable_nonboot_cpus();
 
  Platform_finish: