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

*** 7.0-BETA1/src/sys/dev/usb/usbdevs.~1~	Fri Oct  5 09:26:39 2007
--- new-generic/src/sys/dev/usb/usbdevs	Tue Nov 20 18:07:23 2007
***************
*** 1354,1359 ****
--- 1354,1360 ----
  product HP 1220C		0x0212	DeskJet 1220C
  product HP 810C			0x0304	DeskJet 810C/812C
  product HP 4300C		0x0305	Scanjet 4300C
+ product HP 4400C		0x0705  Scanjet 4400C
  product HP CDW4E		0x0307	CD-Writer+ CD-4e
  product HP G85XI		0x0311	OfficeJet G85xi
  product HP 1200			0x0317	LaserJet 1200