KVM: arm/arm64: Get rid of unused arg in cpu_init_hyp_mode()

As arg dummy is not really needed, there's no need to pass
NULL when calling cpu_init_hyp_mode(). So clean it up.

Fixes: 67f69197 ("arm64: kvm: allows kvm cpu hotplug")
Reviewed-by: Steven Price <steven.price@arm.com>
Signed-off-by: Miaohe Lin <linmiaohe@huawei.com>
Signed-off-by: Marc Zyngier <maz@kernel.org>
Link: https://lore.kernel.org/r/1574320559-5662-1-git-send-email-linmiaohe@huawei.com

virt/kvm/arm/arm.c

@@ -1352,7 +1352,7 @@ long kvm_arch_vm_ioctl(struct file *filp,
 	}
 }
 
-static void cpu_init_hyp_mode(void *dummy)
+static void cpu_init_hyp_mode(void)
 {
 	phys_addr_t pgd_ptr;
 	unsigned long hyp_stack_ptr;
@@ -1386,7 +1386,7 @@ static void cpu_hyp_reinit(void)
 	if (is_kernel_in_hyp_mode())
 		kvm_timer_init_vhe();
 	else
-		cpu_init_hyp_mode(NULL);
+		cpu_init_hyp_mode();
 
 	kvm_arm_init_debug();