sbcut_locked
sbcut_locked(&so->so_rcv, len);
mfree = sbcut_locked(&so->so_snd,
mfree = sbcut_locked(&so->so_snd, acked);
mfree = sbcut_locked(&so->so_snd, acked_amount);
mfree = sbcut_locked(&so->so_snd, acked_amount);
mfree = sbcut_locked(&so->so_snd, acked);
mfree = sbcut_locked(&so->so_snd, acked_amount);
sbcut_locked(struct sockbuf *sb, int len);