KVM: More 0 -> NULL conversions

Signed-off-by: Avi Kivity <avi@qumranet.com>

drivers/kvm/kvm_main.c

@@ -2229,13 +2229,13 @@ static void kvm_exit_debug(void)
 static int kvm_suspend(struct sys_device *dev, pm_message_t state)
 {
 	decache_vcpus_on_cpu(raw_smp_processor_id());
-	on_each_cpu(kvm_arch_ops->hardware_disable, 0, 0, 1);
+	on_each_cpu(kvm_arch_ops->hardware_disable, NULL, 0, 1);
 	return 0;
 }
 
 static int kvm_resume(struct sys_device *dev)
 {
-	on_each_cpu(kvm_arch_ops->hardware_enable, 0, 0, 1);
+	on_each_cpu(kvm_arch_ops->hardware_enable, NULL, 0, 1);
 	return 0;
 }