Update miniz_zip.c

Bugfix: MultiByteToWideChar() is being called with a byte count instead of a character count. This will cause a buffer overrun.

Author: jpcha2

miniz_zip.c

@@ -48,7 +48,7 @@ static WCHAR* mz_utf8z_to_widechar(const char* str)
 {
   int reqChars = MultiByteToWideChar(CP_UTF8, 0, str, -1, NULL, 0);
   WCHAR* wStr = (WCHAR*)malloc(reqChars * sizeof(WCHAR));
-  MultiByteToWideChar(CP_UTF8, 0, str, -1, wStr, sizeof(WCHAR) * reqChars);
+  MultiByteToWideChar(CP_UTF8, 0, str, -1, wStr, reqChars);
   return wStr;
 }