Removing some copy pasted code Part-of: <https://gitlab.freedesktop.org/gstreamer/gstreamer/-/merge_requests/2970>
Check that width*height*sizeof(guint32) doesn't overflow when allocated user_data for mask, potential for heap overwrite when inverting. Fixes https://gitlab.freedesktop.org/gstreamer/gstreamer/-/issues/1231 Part-of: <https://gitlab.freedesktop.org/gstreamer/gstreamer/-/merge_requests/2603>