match va_start() with va_end()

Change-Id: I5c3c2570d6311f49da95bb80c0f9850f89970235

shell/inc/internal/utilities.hxx

@@ -120,6 +120,7 @@ inline void OutputDebugStringFormat( LPCSTR pFormat, ... )
 
     va_start( args, pFormat );
     StringCchVPrintfA( buffer, sizeof(buffer), pFormat, args );
+    va_end( args );
     OutputDebugStringA( buffer );
 }
 #else