Misc libusb cleanups
authorAntonio Ospite <ao2@ao2.it>
Wed, 10 Jun 2015 09:13:04 +0000 (11:13 +0200)
committerAntonio Ospite <ao2@ao2.it>
Wed, 10 Jun 2015 09:15:08 +0000 (11:15 +0200)
Use symbolic constants, check return values, auto detach the kernel
driver, release the interface.


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