typefindhelper: Fix gobject-introspection warning about invalid transfer annotation
typefindhelper: Fix gobject-introspection warning about invalid transfer annotation

gsttypefindhelper.c:485: Warning: GstBase: invalid "transfer" annotation for gsize: only valid for array, struct, union, boxed, object and interface types

StreamUtils/gstreamer,StreamUtils/gstreamer,StreamUtils/gstreamer,StreamUtils/gstreamer,StreamUtils/gstreamer