[ns] Correction to my previous scoreboard.cc patch

[Ethan Blanton]

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Once again...

Sorry to clutter your mailboxes with an extra message when I shoulda caught
this the first time, but the attached patch makes my previous scoreboard.cc
patch actually work.  ;-)
Ethan

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83,84c83,84
< 	if (SBN[first_].seq_no_ <= last_ack) {
< 		for (i=SBN[(first_)%SBSIZE].seq_no_; i<=last_ack; i++) {
---
> 	if (length_ && SBN[first_].seq_no_ <= last_ack) {
> 		for (i=SBN[first_].seq_no_; i<=last_ack; i++) {

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