KVM: ia64: Add missing spin_unlock in kvm_arch_hardware_enable()

Add a spin_unlock missing on the error path.

The semantic match that finds this problem is as follows:
(http://coccinelle.lip6.fr/)

// <smpl>
@@
expression E1;
@@

* spin_lock(E1,...);
  <+... when != E1
  if (...) {
    ... when != E1
*   return ...;
  }
  ...+>
* spin_unlock(E1,...);
// </smpl>

Signed-off-by: Julia Lawall <julia@diku.dk>
Signed-off-by: Avi Kivity <avi@redhat.com>

arch/ia64/kvm/kvm-ia64.c

@@ -144,6 +144,7 @@ int kvm_arch_hardware_enable(void *garbage)
 				VP_INIT_ENV : VP_INIT_ENV_INITALIZE,
 			__pa(kvm_vm_buffer), KVM_VM_BUFFER_BASE, &tmp_base);
 	if (status != 0) {
+		spin_unlock(&vp_lock);
 		printk(KERN_WARNING"kvm: Failed to Enable VT Support!!!!\n");
 		return -EINVAL;
 	}