am7xxx: use libusb_error_name to print the return value of libusb calls
authorAntonio Ospite <ao2@ao2.it>
Sun, 25 Jan 2015 23:20:20 +0000 (00:20 +0100)
committerAntonio Ospite <ao2@ao2.it>
Sun, 25 Jan 2015 23:20:20 +0000 (00:20 +0100)
This makes the debug output more useful.


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