Work around Marinetti bug where TCPIPReadLineTCP could incorrectly return an error value.

This should now be fixed in the latest Marinetti, but we'll keep the workaround to minimize the chance of problems.

http.c

@@ -149,11 +149,12 @@ netRetry:
     LongWord startTime = GetTick();
     do {
         TCPIPPoll();
+        u.rlrBuff.rlrBuffCount = 0;
         tcpError = TCPIPReadLineTCP(sess->ipid,
                 (void*)((LongWord)"\p\r\n\r\n" | 0x80000000),
                 buffTypeNewHandle, (Ref)NULL,
                 0xFFFFFF, &u.rlrBuff);
-        if (tcpError || toolerror()) {
+        if ((tcpError && u.rlrBuff.rlrBuffCount == 0) || toolerror()) {
             if (netErrors == 0) {
                 netErrors++;
                 goto netRetry;