input-selector: small code cleanups
input-selector: small code cleanups

Rename TIMESTAMP -> PTS. Move a var down to the scope where it is used. Use
g_queue_free_full().

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