Fixed bug in debug_vsprintf(): Make sure _vsnprintf() in try_vsnprintf() always appends a NUL to its output.
Fixed bug in debug_vsprintf(): Make sure _vsnprintf() in try_vsnprintf() always appends a NUL to its output.

JFLarvoire/SysToolsLib,JFLarvoire/SysToolsLib,JFLarvoire/SysToolsLib,JFLarvoire/SysToolsLib