Add HP_ScanJet_4400c
Someone else patch has already been commited to current.

*** 4.11-RELEASE/src/sys/dev/usb/uscanner.c.old	Tue Jun 20 11:02:55 2006
--- new/src/sys/dev/usb/uscanner.c	Tue Jun 20 11:03:19 2006
***************
*** 135,140 ****
--- 135,141 ----
   {{ USB_VENDOR_HP, USB_PRODUCT_HP_4100C }, 0 },
   {{ USB_VENDOR_HP, USB_PRODUCT_HP_4200C }, 0 },
   {{ USB_VENDOR_HP, USB_PRODUCT_HP_4300C }, 0 },
+  {{ USB_VENDOR_HP, USB_PRODUCT_HP_4400C }, 0 },
   {{ USB_VENDOR_HP, USB_PRODUCT_HP_S20 }, 0 },
   {{ USB_VENDOR_HP, USB_PRODUCT_HP_5200C }, 0 },
   {{ USB_VENDOR_HP, USB_PRODUCT_HP_5300C }, 0 },