typefind: simplify registration code
typefind: simplify registration code

Remove a useless assert (we just instantiated this type). Drop the free'ing of
the extension array. As we just created the instance this is always NULL.

jpxiong/gstreamer,shelsonjava/gstreamer,centricular/gstreamer,krichter722/gstreamer,centricular/gstreamer,mparis/gstreamer,jpxiong/gstreamer,jpxiong/gstreamer,centricular/gstreamer,jpxiong/gstreamer,shelsonjava/gstreamer,centricular/gstreamer,krichter722/gstreamer,shelsonjava/gstreamer,mparis/gstreamer,mparis/gstreamer,shelsonjava/gstreamer,krichter722/gstreamer,StreamUtils/gstreamer,StreamUtils/gstreamer,StreamUtils/gstreamer,centricular/gstreamer,krichter722/gstreamer,krichter722/gstreamer,mparis/gstreamer,shelsonjava/gstreamer,jpxiong/gstreamer,mparis/gstreamer,StreamUtils/gstreamer,StreamUtils/gstreamer