MINOR: quic: take out xprt snd_buf operation

Rename quic_conn_to_buf to qc_snd_buf and remove it from xprt ops. This
is done to reflect the true usage of this function which is only a
wrapper around sendto but cannot be called by the upper layer.

qc_snd_buf is moved in quic-sock because to mark its link with
quic_sock_fd_iocb which is the recvfrom counterpart.
3 files changed