vfio/pci: Hold igate across releasing eventfd contexts

No need to release and immediately re-acquire igate while clearing
out the eventfd ctxs.
Reviewed-by: NCornelia Huck <cohuck@redhat.com>
Signed-off-by: NAlex Williamson <alex.williamson@redhat.com>

drivers/vfio/pci/vfio_pci.c

@@ -523,14 +523,12 @@ static void vfio_pci_release(void *device_data)
 		vfio_pci_vf_token_user_add(vdev, -1);
 		vfio_spapr_pci_eeh_release(vdev->pdev);
 		vfio_pci_disable(vdev);
+
 		mutex_lock(&vdev->igate);
 		if (vdev->err_trigger) {
 			eventfd_ctx_put(vdev->err_trigger);
 			vdev->err_trigger = NULL;
 		}
-		mutex_unlock(&vdev->igate);
-
-		mutex_lock(&vdev->igate);
 		if (vdev->req_trigger) {
 			eventfd_ctx_put(vdev->req_trigger);
 			vdev->req_trigger = NULL;