In preparation for adding new functions and overrides to the
V4L2M2MDevice class, add an override specifier to all overridden
functions in the class. This prevents -Winconsistent-missing-override
warnings.
Signed-off-by: Stefan Klug <stefan.klug@ideasonboard.com>
Reviewed-by: Jacopo Mondi <jacopo.mondi@ideasonboard.com>
Reviewed-by: Paul Elder <paul.elder@ideasonboard.com>
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