The MediaDevice::driver(), deviceNode() and model() functions return a
const std::string, copying the string stored internally in the class.
Return references instead to avoid copies.
Signed-off-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
Reviewed-by: Kieran Bingham <kieran.bingham@ideasonboard.com>
Reviewed-by: Paul Elder <paul.elder@ideasonboard.com>
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