[Libreoffice] [REVIEW] Proper initialization and copying of union matrix value.

[Kohei Yoshida]

I'd like to commit the attached patch to the 3.4 branch.  This was
discovered by the unit test which failed when an empty matrix element
didn't have a value of 0.0.  As it turned out, I was initializing the
higher 4 bytes via 32-bit pointer but the lower 4 bytes were left
un-initialized, which caused the double value to become non-zero.
Apparently this doesn't happen when building a 64-bit build.

Thanks,

Kohei
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