ControllerInterface: Make UpdateInput / UpdateOutput return void

The return values here have never been checked, so it doesn't make sense
to return a value to begin with.

Source/Core/InputCommon/ControllerInterface/DInput/DInputJoystick.cpp

@@ -177,7 +177,7 @@ std::string Joystick::GetSource() const
 
 // update IO
 
-bool Joystick::UpdateInput()
+void Joystick::UpdateInput()
 {
 	HRESULT hr = 0;
 
@@ -215,9 +215,7 @@ bool Joystick::UpdateInput()
 
 	// try reacquire if input lost
 	if (DIERR_INPUTLOST == hr || DIERR_NOTACQUIRED == hr)
-		hr = m_device->Acquire();
-
-	return SUCCEEDED(hr);
+		m_device->Acquire();
 }
 
 // get name

Source/Core/InputCommon/ControllerInterface/DInput/DInputJoystick.h

@@ -52,7 +52,7 @@ private:
 	};
 
 public:
-	bool UpdateInput();
+	void UpdateInput() override;
 
 	Joystick(const LPDIRECTINPUTDEVICE8 device, const unsigned int index);
 	~Joystick();

Source/Core/InputCommon/ControllerInterface/DInput/DInputKeyboardMouse.cpp

@@ -139,7 +139,7 @@ void GetMousePos(ControlState* const x, ControlState* const y)
 	*y = (ControlState)point.y / (ControlState)win_height * 2 - 1;
 }
 
-bool KeyboardMouse::UpdateInput()
+void KeyboardMouse::UpdateInput()
 {
 	DIMOUSESTATE2 tmp_mouse;
 
@@ -175,11 +175,7 @@ bool KeyboardMouse::UpdateInput()
 
 		// update mouse cursor
 		GetMousePos(&m_state_in.cursor.x, &m_state_in.cursor.y);
-
-		return true;
 	}
-
-	return false;
 }
 
 std::string KeyboardMouse::GetName() const

Source/Core/InputCommon/ControllerInterface/DInput/DInputKeyboardMouse.h

@@ -77,7 +77,7 @@ private:
 	};
 
 public:
-	bool UpdateInput();
+	void UpdateInput() override;
 
 	KeyboardMouse(const LPDIRECTINPUTDEVICE8 kb_device, const LPDIRECTINPUTDEVICE8 mo_device);
 	~KeyboardMouse();