Updated openstack/openstack
Project: openstack/nova  61fcda79cb90b3d5975fe0ab8a359e7bd057f343

Compute: improve usage of Xen driver support

Commit 69564763960cddc249138469811a0a771db16e19 added a check,
which was called twice, in get_next_device_name.

This is called once now.

Change-Id: I45c918bc64ed8049179fc01a7cd3ad81e4682fe1