The matrixVlidateYaml() function is declared in the libcamera::ipa:: namespace, but defined in the libcamera:: namespace. This causes a dynamic linking error at runtime. Fix it by moving the function definition. Signed-off-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com> Tested-by: Jacopo Mondi <jacopo.mondi@ideasonboard.com> Reviewed-by: Paul Elder <paul.elder@ideasonboard.com>