(svn r18508) -Fix [FS#3372]: if a rail station class had less data than capacity it would try to set a negative position

src/core/math_func.hpp

@@ -150,6 +150,7 @@ static FORCEINLINE T *AlignPtr(T *x, uint n)
 template <typename T>
 static FORCEINLINE T Clamp(const T a, const T min, const T max)
 {
+	assert(min <= max);
 	if (a <= min) return min;
 	if (a >= max) return max;
 	return a;