rtptfrc: Add some G_LIKELY
rtptfrc: Add some G_LIKELY

tieto/farstream,pexip/farstream,kakaroto/farstream,pexip/farstream,tieto/farstream,kakaroto/farstream,kakaroto/farstream,shadeslayer/farstream,shadeslayer/farstream,tieto/farstream,pexip/farstream,tieto/farstream,kakaroto/farstream,pexip/farstream,tieto/farstream,shadeslayer/farstream,shadeslayer/farstream