Warning fixes, fix hw back button on Android

UI/EmuScreen.cpp

@@ -284,6 +284,9 @@ void EmuScreen::onVKeyUp(int virtualKeyCode) {
 }
 
 void EmuScreen::key(const KeyInput &key) {
+	if (key.keyCode == KEYCODE_BACK)
+		pauseTrigger_ = true;
+
 	int result = KeyMap::KeyToPspButton(key.deviceId, key.keyCode);
 	if (result == KEYMAP_ERROR_UNKNOWN_KEY)
 		return;

UI/EmuScreen.h

@@ -50,13 +50,12 @@ private:
 	void onVKeyDown(int virtualKeyCode);
 	void onVKeyUp(int virtualKeyCode);
 
-
-	bool pauseTrigger_;
-
 	// Something invalid was loaded, don't try to emulate
 	bool invalid_;
 	std::string errorMessage_;
 
+	bool pauseTrigger_;
+
 	// To track mappable virtual keys. We can have as many as we want.
 	bool virtKeys[VIRTKEY_COUNT];
 };

UI/GamepadEmu.h

@@ -34,7 +34,7 @@ public:
 	virtual void Touch(const TouchInput &input);
 	virtual void Draw(UIContext &dc);
 	virtual void GetContentDimensions(const UIContext &dc, float &w, float &h) const;
-	virtual bool IsDown() { return pointerDownMask_ != NULL; }
+	virtual bool IsDown() { return pointerDownMask_ != 0; }
 	// chainable
 	MultiTouchButton *FlipImageH(bool flip) { flipImageH_ = flip; return this; }
 	MultiTouchButton *SetAngle(float angle) { angle_ = angle; return this; }
@@ -88,12 +88,12 @@ public:
 
 private:
 	void ProcessTouch(float x, float y, bool down);
-	float radius_;
-	float scale_;
-
 	int arrowIndex_;
 	int overlayIndex_;
 
+	float scale_;
+	float radius_;
+
 	int dragPointerId_;
 	int down_;
 };