Unbreak USB autoconnect filters

Commit 22f84e73 added a qdev_init() missing on the path through
usb_host_device_open(), but that broke the path through
usb_host_auto_scan(), which already had one.  Remove that one.

Patchworks-ID: 35169
Signed-off-by: NMarkus Armbruster <armbru@redhat.com>
Signed-off-by: NAnthony Liguori <aliguori@us.ibm.com>

usb-linux.c

@@ -1396,8 +1396,6 @@ static int usb_host_auto_scan(void *opaque, int bus_num, int addr,
         dprintf("husb: auto open: bus_num %d addr %d\n", bus_num, addr);
 
 	dev = usb_host_device_open_addr(bus_num, addr, product_name);
-	if (dev)
-            qdev_init(&dev->qdev);
     }
 
     return 0;