Description: Fix segfault when starting new game after viewing introduction
 Segfault is caused by memory corruption when Intro.update calls
 intro_finished(), and intro_finished deletes the Intro. This patch is a
 workaround to stop the game from crashing.
Forwarded: not yet
Author: Steve Cotton <steve@s.cotton.clara.co.uk>
Bug-Debian: http://bugs.debian.org/636014

--- a/src/intro.cpp
+++ b/src/intro.cpp
@@ -150,7 +150,11 @@
   else if (state == (sum += 12))
     ;				// do nothing, just wait
   else if (state >= (sum += 1))
+  {
     mw.intro_finished();
+    // this Intro has just been deleted, so return immediately
+    return true;
+  }
   else
     changed = false;