MINOR: quic: Remove useless traces about references to TX packets

Since this commit:
    "BUG/MINOR: quic: Wrong list_for_each_entry() use when building packets from
     qc_do_build_pkt()"
there is no more reason that frames can be released without having been
sent, i.e. frames with non null ->pkt member. This ->pkt is the packet
the frame is attached to.

Must be backported to 2.6.
1 file changed