adapter: avoid multiple calls to gst_buffer_get_size() in macro
adapter: avoid multiple calls to gst_buffer_get_size() in macro

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