Patch for memory corruption.

[Eugene 'HMage' Bujak]

Hello!

I want to send a patch for a bug I've discovered in Exim4. It's easily  
reproducible once you modify the code. In the wild it's hard to catch  
but I've been searching for cause of constant segfaults for a long time.

The reason I'm sending you a patch instead of opening a bug because  
I've already registered a bug upstream -- http://bugs.exim.org/show_bug.cgi?id=787

If you want I can open a bug in debian bug tracking system but I think  
it can be superfluous.

Tell me what you think.

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- Eugene 'HMage' Bujak.