qdev: Rename USBDevice member devname to product_desc

It's not a device name, it's the USB product description string.

Signed-off-by: Markus Armbruster <[email protected]>
Signed-off-by: Anthony Liguori <[email protected]>
diff --git a/usb-linux.c b/usb-linux.c
index 285ac22..67735d3 100644
--- a/usb-linux.c
+++ b/usb-linux.c
@@ -933,10 +933,10 @@
         dev->dev.speed = USB_SPEED_HIGH;
 
     if (!prod_name || prod_name[0] == '\0')
-        snprintf(dev->dev.devname, sizeof(dev->dev.devname),
+        snprintf(dev->dev.product_desc, sizeof(dev->dev.product_desc),
                  "host:%d.%d", bus_num, addr);
     else
-        pstrcpy(dev->dev.devname, sizeof(dev->dev.devname),
+        pstrcpy(dev->dev.product_desc, sizeof(dev->dev.product_desc),
                 prod_name);
 
     /* USB devio uses 'write' flag to check for async completions */