#68 Fix initialiser of TiXmlString::nullrep_

[Nicos Gollan]

In tinystr.cpp:

// Null rep.
TiXmlString::Rep TiXmlString::nullrep_ = { 0, 0, '\0' };

should be:

// Null rep.
TiXmlString::Rep TiXmlString::nullrep_ = { 0, 0, {'\0'} };

since the third element is initialising an array.

[Lee Thomason]

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Good catch. Subtle. Fixed in 2.5.3