Make XRRGet*Property() always initialize returned values

Avoids memory corruption and other errors when callers access them
without checking to see if the calls returned an error value.

Callers are still required to check for errors, this just reduces the
damage when they don't.

(Same as reported against libX11 XGetWindowProperty by Ilja Van Sprundel)

Signed-off-by: Alan Coopersmith <alan.coopersmith@oracle.com>

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