[PATCH 2/2] vsnprintfW: Return (int)written when given a NULL buffer and zero len

[Hugh McMaster]

msvcrt.dll's _vsnprintf and _vsnwprintf return the number of chars that would be written when given a NULL buffer and zero len, but Wine currently returns -1. This patch alters Wine's vsnprintfW (found in libs/wine/string.c) to follow msvcrt's behaviour in this special case.

This patch is essential for dynamic memory management used in upcoming patches.
 		 	   		  
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