clang-modernize -use-nullptr

and s/\bNULL\b/nullptr/g for *.cpp/h/mm files not compiled on my machine

Source/Core/InputCommon/ControllerInterface/ControllerInterface.h

@@ -83,7 +83,7 @@ public:
 		}
 
 	protected:
-		ControlReference(const bool _is_input) : range(1), is_input(_is_input), parsed_expression(NULL) {}
+		ControlReference(const bool _is_input) : range(1), is_input(_is_input), parsed_expression(nullptr) {}
 		ciface::ExpressionParser::Expression *parsed_expression;
 	};
 
@@ -113,7 +113,7 @@ public:
 		Device::Control* Detect(const unsigned int ms, Device* const device) override;
 	};
 
-	ControllerInterface() : m_is_init(false), m_hwnd(NULL) {}
+	ControllerInterface() : m_is_init(false), m_hwnd(nullptr) {}
 
 	void SetHwnd(void* const hwnd);
 	void Initialize();