configfs: Don't guess interface numbers if they can't be parsed

Interface numbers are crucial parameters required for proper UVC gadget
operation. If we can't parse them from ConfigFS there's little point in
falling back to defaults that have a high chance being wrong. Treating
that case as a fatal error is better to get the root cause fixed.

Signed-off-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
Reviewed-by: Kieran Bingham <kieran.bingham@ideasonboard.com>

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