KVM: Remove unneeded kvm_dev_open and kvm_dev_release functions.

Devices don't need open or release functions.
Signed-off-by: Rusty Russell <rusty@rustcorp.com.au>
Signed-off-by: Avi Kivity <avi@qumranet.com>

drivers/kvm/kvm_main.c

@@ -302,11 +302,6 @@ static struct kvm *kvm_create_vm(void)
 	return kvm;
 }
 
-static int kvm_dev_open(struct inode *inode, struct file *filp)
-{
-	return 0;
-}
-
 /*
  * Free any memory in @free but not in @dont.
  */
@@ -376,11 +371,6 @@ static void kvm_free_vcpus(struct kvm *kvm)
 
 }
 
-static int kvm_dev_release(struct inode *inode, struct file *filp)
-{
-	return 0;
-}
-
 static void kvm_destroy_vm(struct kvm *kvm)
 {
 	spin_lock(&kvm_lock);
@@ -2841,8 +2831,6 @@ static long kvm_dev_ioctl(struct file *filp,
 }
 
 static struct file_operations kvm_chardev_ops = {
-	.open		= kvm_dev_open,
-	.release        = kvm_dev_release,
 	.unlocked_ioctl = kvm_dev_ioctl,
 	.compat_ioctl   = kvm_dev_ioctl,
 };