KVM: Clean up kvm_vm_ioctl_create_vcpu()

Since c9d601548603 ("KVM: allow KVM_BUG/KVM_BUG_ON to handle 64-bit cond")
'cond' is internally converted to boolean, so caller's explicit conversion
from void* is unnecessary.

Remove the double bang.

Signed-off-by: Michal Luczaj <[e-mail]>
Reviewed-by: Yuan Yao <[e-mail]>
base-commit: 76a17bf03a268bc342e08c05d8ddbe607d294eb4
Link: https://lore.kernel.org/r/[e-mail]
Signed-off-by: Sean Christopherson <[e-mail]>

virt/kvm/kvm_main.c

···
 	if (r < 0)
 		goto kvm_put_xa_release;
 
-	if (KVM_BUG_ON(!!xa_store(&kvm->vcpu_array, vcpu->vcpu_idx, vcpu, 0), kvm)) {
+	if (KVM_BUG_ON(xa_store(&kvm->vcpu_array, vcpu->vcpu_idx, vcpu, 0), kvm)) {
 		r = -EINVAL;
 		goto kvm_put_xa_release;
 	}