Minor code cleanup

src/modules/joystick/Joystick.cpp

@@ -29,7 +29,7 @@ namespace love
 namespace joystick
 {
 
-float Joystick::clampval(float x) const
+float Joystick::clampval(float x)
 {
 	if (fabsf(x) < 0.01)
 		return 0.0f;

src/modules/joystick/Joystick.h

@@ -173,9 +173,7 @@ public:
 	static bool getConstant(const char *in, InputType &out);
 	static bool getConstant(InputType in, const char *&out);
 
-protected:
-
-	float clampval(float x) const;
+	static float clampval(float x);
 
 private: