rtptfrc: Make sure bitrate doesn't roll over G_MAXUINT
rtptfrc: Make sure bitrate doesn't roll over G_MAXUINT

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