AcerScan 320U's are braindead. Sometimes they do not return strings

descriptors and if they do the strings are nonsense.

sys/dev/usb/usb_quirks.c

@@ -73,6 +73,8 @@ Static struct usbd_quirk_entry {
  { USB_VENDOR_MCT, USB_PRODUCT_MCT_USB232,          0x102, { UQ_BUS_POWERED }},
  { USB_VENDOR_METRICOM, USB_PRODUCT_METRICOM_RICOCHET_GS,
  	0x100, { UQ_ASSUME_CM_OVER_DATA | UQ_NO_STRINGS }},
+ { USB_VENDOR_ACERP, USB_PRODUCT_ACERP_ACERSCAN_320U,
+ 						    0x000, { UQ_NO_STRINGS }},
  { 0, 0, 0, { 0 } }
 };