EXT-8318 FIX IMPROVED Code is refactored - avoid using of a separate call of...

EXT-8318 FIX IMPROVED Code is refactored - avoid using of a separate call of the MultiByteToWideChar to get length of output string.

Assumprion is: wide char buffer requires not more than input string length plus one for a null terminator.

Reviewed by Richard Nelson at https://codereview.productengine.com/secondlife/r/775/

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branch : product-engine