Re: free(NULL) atexit (ITS#1014)

[bcollins@debian.org]

> It appears that some md5 code is registering a function via atexit() which will
> attempt to free NULL. For some reason the program doesn't die when this happens;
> perhaps it has something to do with the fact that it's already exiting. Anyway,
> here's the skinny:

free(NULL) is a NOP in C. Yes, it's buggy to rely on that, but I'm just
pointing out why it doesn't crash when this happens.

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