downloadbuffer: small cleanups
downloadbuffer: small cleanups

shelsonjava/gstreamer,centricular/gstreamer,mparis/gstreamer,shelsonjava/gstreamer,surround-io/gstreamer,krichter722/gstreamer,krichter722/gstreamer,surround-io/gstreamer,StreamUtils/gstreamer,jpakkane/gstreamer,jpxiong/gstreamer,mparis/gstreamer,surround-io/gstreamer,krichter722/gstreamer,shelsonjava/gstreamer,jpakkane/gstreamer,Lachann/gstreamer,mparis/gstreamer,jpakkane/gstreamer,jpxiong/gstreamer,Lachann/gstreamer,Lachann/gstreamer,centricular/gstreamer,krichter722/gstreamer,jpxiong/gstreamer,StreamUtils/gstreamer,surround-io/gstreamer,jpxiong/gstreamer,jpakkane/gstreamer,shelsonjava/gstreamer,mparis/gstreamer,StreamUtils/gstreamer,surround-io/gstreamer,StreamUtils/gstreamer,centricular/gstreamer,jpakkane/gstreamer,shelsonjava/gstreamer,Lachann/gstreamer,mparis/gstreamer,centricular/gstreamer,krichter722/gstreamer,centricular/gstreamer,Lachann/gstreamer,StreamUtils/gstreamer,jpxiong/gstreamer