net: remove NICInfo::private

Was used by hot-unplug, but not anymore.
Signed-off-by: NMark McLoughlin <markmc@redhat.com>
Signed-off-by: NAnthony Liguori <aliguori@us.ibm.com>

net.h

@@ -124,7 +124,6 @@ struct NICInfo {
     char *devaddr;
     VLANState *vlan;
     VLANClientState *netdev;
-    void *private;
     int used;
     int bootable;
     int nvectors;