[Path] remove superfluous nullptr checks

src/Mod/Path/PathSimulator/App/PathSim.cpp

@@ -46,9 +46,9 @@ PathSim::PathSim()
 
 PathSim::~PathSim()
 {
-	if (m_stock != nullptr)
+	if (m_stock)
 	    delete m_stock;
-	if (m_tool != nullptr)
+	if (m_tool)
 		delete m_tool;
 }
 
@@ -68,7 +68,7 @@ Base::Placement * PathSim::ApplyCommand(Base::Placement * pos, Command * cmd)
 	Point3D fromPos(*pos);
 	Point3D toPos(*pos);
 	toPos.UpdateCmd(*cmd);
-	if (m_tool != nullptr)
+	if (m_tool)
 	{
 		if (cmd->Name == "G0" || cmd->Name == "G1")
 		{

src/Mod/Path/PathSimulator/App/PathSimPyImp.cpp

@@ -87,7 +87,7 @@ PyObject* PathSimPy::GetResultMesh(PyObject * args)
 	if (!PyArg_ParseTuple(args, ""))
 		return nullptr;
 	cStock *stock = getPathSimPtr()->m_stock;
-	if (stock == nullptr)
+	if (!stock)
 	{
 		PyErr_SetString(PyExc_RuntimeError, "Simulation has stock object");
 		return nullptr;

src/Mod/Path/PathSimulator/App/VolSim.h

@@ -119,7 +119,7 @@ public:
 
 	~Array2D()
 	{
-		if (data != nullptr)
+		if (data)
 			delete[] data;
 	}