MINOR: quic: Remove a useless test about probing in qc_prep_pkts()

qel->pktns->tx.pto_probe is set to 0 after having prepared a probing
datagram. There is no reason to check this parameter. Furthermore
it is always 0 when the connection does not probe the peer.

Must be backported to 2.6 and 2.7.
1 file changed