[sane-devel] Add function sanei_usb_get_endpoint

[Reinhold Kainhofer]

Since we now have the possibility to change the endpoint used for a particular 
USB communication type, we also need a way to retrieve the current endpoint, 
so that one can e.g. decide whether a switch to a different endpoint is needed 
at all, or reset the endpoint to the old value after a single usb operation on 
a different endpoint.

Attached is a simple patch that adds this function sanei_usb_get_endpoint to 
sanei/, plus a range check in sanei_usb_set_endpoint. Okay to push to master 
or does that already violate the feature freeze?

Cheers,
Reinhold
-- 
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Reinhold Kainhofer, reinhold at kainhofer.com, http://reinhold.kainhofer.com/
 * Financial & Actuarial Math., Vienna Univ. of Technology, Austria
 * http://www.fam.tuwien.ac.at/, DVR: 0005886
 * LilyPond, Music typesetting, http://www.lilypond.org
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