[reSIProcate] assert in sendToWire

[Byron Campen]

	This is a bug that was noticed a little while back. It was occurring  
when repro was trying to retransmit an ACK before the DNS lookup for  
the first had completed. (This can happen easily if we get multiple  
responses rapidly, or the DNS servers are being very slow) This bug  
was uncovered in repro due to the fact that it had previously been  
putting a different tid on each ACK, meaning that a separate  
TransactionState was being maintained for each ACK, so we never had a  
second ACK hitting the same TransactionState to trigger the bug. I'll  
look into fixing this.

Best regards,
Byron Campen

>
>
> On Saturday, I updated to the latest version of reSIProcate from  
> SVN (6901).
>
> Since then, I've been getting this assert() occasionally:
>
>    else // reuse the last dns tuple
>    {
>       assert(sip->isRequest());
>       assert(mTarget.getType() != UNKNOWN_TRANSPORT);  // line 1761  
> ****
>       if (resend)
>       {
>          if (mTarget.transport)
>
> Does anyone have any ideas about the cause of this?
>
> #0  0xb7343947 in raise () from /lib/tls/libc.so.6
> (gdb) bt
> #0  0xb7343947 in raise () from /lib/tls/libc.so.6
> #1  0xb7345212 in abort () from /lib/tls/libc.so.6
> #2  0xb733d05f in __assert_fail () from /lib/tls/libc.so.6
> #3  0xb7d3d95b in resip::TransactionState::sendToWire  
> (this=0xb6968c00,
>     msg=0xb6985e18, resend=false) at TransactionState.cxx:1761
> #4  0xb7d40344 in resip::TransactionState::processStateless
> (this=0xb6968c00,
>     message=0xb6985e18) at TransactionState.cxx:523
> #5  0xb7d443e3 in resip::TransactionState::process  
> (controller=@0xb725eb8c)
>     at TransactionState.cxx:262
> #6  0xb7d338aa in resip::TransactionController::process  
> (this=0xb725eb8c,
>     fdset=@0xbfffdcd0) at TransactionController.cxx:83
>
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