Fix for "the guninski bug", an integer overflow in case a single header from
an incoming SMTP message is over 2GB long, by simply not counting any further
than it really needs to. BUG: http://www.guninski.com/qmailcrash.html

diff -ruN qmail-1.03-7.05/qmail-smtpd.c qmail-1.03-7.06/qmail-smtpd.c
--- qmail-1.03-7.05/qmail-smtpd.c	2008-05-12 16:06:46.000000000 -0400
+++ qmail-1.03-7.06/qmail-smtpd.c	2008-01-23 09:25:44.000000000 -0500
@@ -1048,8 +1048,8 @@
         if (flagmaybex) if (pos == 7) ++*hops;
         if (pos < 2) if (ch != "\r\n"[pos]) flagmaybey = 0;
         if (flagmaybey) if (pos == 1) flaginheader = 0;
+        ++pos;
       }
-      ++pos;
       if (ch == '\n') { pos = 0; flagmaybex = flagmaybey = flagmaybez = 1; }
     }
     switch(state) {