This fixes an X server side memory leak, this is normally not severe but in some circumstances where the glwindow is recreated frequently it can result in a very bad memory leak. Part-of: <https://gitlab.freedesktop.org/gstreamer/gstreamer/-/merge_requests/4047>
And fix a memory leaks in gst_gl_display_egl_new() error cases. Part-of: <https://gitlab.freedesktop.org/gstreamer/gstreamer/-/merge_requests/3194>