[Mimedefang] Trouble with ClamAV-0.66

[Bill Maidment]

Just letting you guys know that I have found a bug in clamav-0.66 when 
you are using the HTTPProxyUsername and HTTPProxyPassword parameters.

The fix is:

In freshclam/manager.c line 362
changed
            char* buf = mmalloc(strlen(user)*2+4);
to
            char* buf = mmalloc(strlen(user)*2+5);
to allow for the \0 to be added.

Cheers
Bill