Cleanup: Clang-Tidy modernize-use-nullptr

Replace `NULL` with `nullptr` in C++ code.

No functional changes.

source/blender/freestyle/intern/python/BPy_Freestyle.cpp

@@ -72,7 +72,7 @@ static PyObject *Freestyle_getCurrentScene(PyObject * /*self*/)
   Scene *scene = g_freestyle.scene;
   if (!scene) {
     PyErr_SetString(PyExc_TypeError, "current scene not available");
-    return NULL;
+    return nullptr;
   }
   PointerRNA ptr_scene;
   RNA_pointer_create(&scene->id, &RNA_Scene, scene, &ptr_scene);
@@ -166,12 +166,12 @@ static PyObject *Freestyle_blendRamp(PyObject * /*self*/, PyObject *args)
   float a[3], fac, b[3];
 
   if (!PyArg_ParseTuple(args, "sOfO", &s, &obj1, &fac, &obj2)) {
-    return NULL;
+    return nullptr;
   }
   type = ramp_blend_type(s);
   if (type < 0) {
     PyErr_SetString(PyExc_TypeError, "argument 1 is an unknown ramp blend type");
-    return NULL;
+    return nullptr;
   }
   if (mathutils_array_parse(a,
                             3,
@@ -179,7 +179,7 @@ static PyObject *Freestyle_blendRamp(PyObject * /*self*/, PyObject *args)
                             obj1,
                             "argument 2 must be a 3D vector "
                             "(either a tuple/list of 3 elements or Vector)") == -1) {
-    return NULL;
+    return nullptr;
   }
   if (mathutils_array_parse(b,
                             3,
@@ -187,10 +187,10 @@ static PyObject *Freestyle_blendRamp(PyObject * /*self*/, PyObject *args)
                             obj2,
                             "argument 4 must be a 3D vector "
                             "(either a tuple/list of 3 elements or Vector)") == -1) {
-    return NULL;
+    return nullptr;
   }
   ramp_blend(type, a, fac, b);
-  return Vector_CreatePyObject(a, 3, NULL);
+  return Vector_CreatePyObject(a, 3, nullptr);
 }
 
 #include "BKE_colorband.h" /* BKE_colorband_evaluate() */
@@ -214,18 +214,18 @@ static PyObject *Freestyle_evaluateColorRamp(PyObject * /*self*/, PyObject *args
   float in, out[4];
 
   if (!(PyArg_ParseTuple(args, "O!f", &pyrna_struct_Type, &py_srna, &in))) {
-    return NULL;
+    return nullptr;
   }
   if (!RNA_struct_is_a(py_srna->ptr.type, &RNA_ColorRamp)) {
     PyErr_SetString(PyExc_TypeError, "1st argument is not a ColorRamp object");
-    return NULL;
+    return nullptr;
   }
   coba = (ColorBand *)py_srna->ptr.data;
   if (!BKE_colorband_evaluate(coba, in, out)) {
     PyErr_SetString(PyExc_ValueError, "failed to evaluate the color ramp");
-    return NULL;
+    return nullptr;
   }
-  return Vector_CreatePyObject(out, 4, NULL);
+  return Vector_CreatePyObject(out, 4, nullptr);
 }
 
 #include "BKE_colortools.h" /* BKE_curvemapping_evaluateF() */
@@ -253,15 +253,15 @@ static PyObject *Freestyle_evaluateCurveMappingF(PyObject * /*self*/, PyObject *
   float value;
 
   if (!(PyArg_ParseTuple(args, "O!if", &pyrna_struct_Type, &py_srna, &cur, &value))) {
-    return NULL;
+    return nullptr;
   }
   if (!RNA_struct_is_a(py_srna->ptr.type, &RNA_CurveMapping)) {
     PyErr_SetString(PyExc_TypeError, "1st argument is not a CurveMapping object");
-    return NULL;
+    return nullptr;
   }
   if (cur < 0 || cur > 3) {
     PyErr_SetString(PyExc_ValueError, "2nd argument is out of range");
-    return NULL;
+    return nullptr;
   }
   cumap = (CurveMapping *)py_srna->ptr.data;
   BKE_curvemapping_init(cumap);
@@ -515,7 +515,7 @@ static PyMethodDef module_functions[] = {
      (PyCFunction)Freestyle_evaluateCurveMappingF,
      METH_VARARGS,
      Freestyle_evaluateCurveMappingF___doc__},
-    {NULL, NULL, 0, NULL},
+    {nullptr, nullptr, 0, nullptr},
 };
 
 /*-----------------------Freestyle module definition---------------------------*/
@@ -536,7 +536,7 @@ PyObject *Freestyle_Init(void)
   // initialize modules
   module = PyModule_Create(&module_definition);
   if (!module) {
-    return NULL;
+    return nullptr;
   }
   PyDict_SetItemString(PySys_GetObject("modules"), module_definition.m_name, module);