Karl Palsson bc212bba45 usb: correctly document return type. ...

The three existing usb drivers have no possible path that doesn't return
the object here, so I've left that comment, but it is plausible that
future drivers might have some reason that allows failing to init.  We
should strive to avoid that though.

Fixes github issue: #494

2015-07-29 12:37:40 +00:00

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