Use the return value from gst_element_link_pads() and gst_bin_add() Fixes: ../ext/gl/gstglmixerbin.c:305:12: error: variable 'res' set but not used [-Werror,-Wunused-but-set-variable] gboolean res = TRUE; ^ Part-of: <https://gitlab.freedesktop.org/gstreamer/gstreamer/-/merge_requests/2038>