vfio-ccw: fix memory leaks in vfio_ccw_realize()

vfio-ccw: fix memory leaks in vfio_ccw_realize()

If the subchannel is already attached or if vfio_get_device() fails, the
code jumps to the 'out_device_err' label and doesn't free the string it
has just allocated.

The code should be reworked so that vcdev->vdev.name only gets set when
the device has been attached, and freed when it is about to be detached.
This could be achieved  with the addition of a vfio_ccw_get_device()
function that would be the counterpart of vfio_put_device(). But this is
a more elaborate cleanup that should be done in a follow-up. For now,
let's just add calls to g_free() on the buggy error paths.

Signed-off-by: Greg Kurz <groug@kaod.org>
Message-Id: <152311222681.203086.8874800175539040298.stgit@bahia>
Signed-off-by: Cornelia Huck <cohuck@redhat.com>
(cherry picked from commit be4d026f645eb31078e08d431c93a898b895024e)
Signed-off-by: Michael Roth <mdroth@linux.vnet.ibm.com>