tfrc: Remove dangerous loop and replace with a direct computation
tfrc: Remove dangerous loop and replace with a direct computation

If there is less than one packet received in a RTT, then just jump to the next
packet to compute the next loss interval.

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