Fixed incorrectly reported Ippon response length
Add OptiUPS VS 575C support to PowerCom

Reference: http://news.gmane.org/find-root.php?message_id=%3c20131126085646.GM28832%40lupin%3e
usbhid-ups: fix call to is_usb_device_supported()

The is_usb_device_supported() function now takes a USBDevice_t* instead of a
pair of USB ID values.