There is no real need for a function template. It is not defined in a header file, so it has limited availability, and there exists only a single instantion. So convert it to use `std::ostream` directly, like most `operator<<` in the code base. Signed-off-by: Barnabás Pőcze <barnabas.pocze@ideasonboard.com> Reviewed-by: Kieran Bingham <kieran.bingham@ideasonboard.com> Reviewed-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>