[PATCH:libXdmcp 3/4] Ensure ARRAYofARRAY8 pointers are initialized to NULL

[Mouse]

> Use calloc for the array of pointers to ensure pointers are cleared
> out so we don't try to free garbage if XdmcpDisposeARRAYofARRAY8 is
> called before the caller sets them to valid pointers.

C does not promise that all-bits-0 (what calloc produces) gives nil
pointers (what you need here).  Has X.org given up on portability to
systems where all-bits-0 is not a nil pointer?  If not, this is a nasty
bug waiting to happen.

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