Cleanup: use nullptr instead of zero

source/blender/python/gpu/gpu_py_framebuffer.cc

@@ -333,7 +333,7 @@ static PyObject *pygpu_framebuffer__tp_new(PyTypeObject * /*self*/, PyObject *ar
       "O"  /* `color_slots` */
       ":GPUFrameBuffer.__new__",
       _keywords,
-      0,
+      nullptr,
   };
   if (!_PyArg_ParseTupleAndKeywordsFast(
           args, kwds, &_parser, &depth_attachment, &color_attachements))
@@ -429,7 +429,7 @@ static PyObject *pygpu_framebuffer_clear(BPyGPUFrameBuffer *self, PyObject *args
       "O"  /* `stencil` */
       ":clear",
       _keywords,
-      0,
+      nullptr,
   };
   if (!_PyArg_ParseTupleAndKeywordsFast(args, kwds, &_parser, &py_col, &py_depth, &py_stencil)) {
     return nullptr;
@@ -553,7 +553,7 @@ static PyObject *pygpu_framebuffer_read_color(BPyGPUFrameBuffer *self,
       "O!" /* `data` */
       ":read_color",
       _keywords,
-      0,
+      nullptr,
   };
   if (!_PyArg_ParseTupleAndKeywordsFast(args,
                                         kwds,
@@ -651,7 +651,7 @@ static PyObject *pygpu_framebuffer_read_depth(BPyGPUFrameBuffer *self,
       "O!" /* `data` */
       ":read_depth",
       _keywords,
-      0,
+      nullptr,
   };
   if (!_PyArg_ParseTupleAndKeywordsFast(
           args, kwds, &_parser, &x, &y, &w, &h, &BPyGPU_BufferType, &py_buffer))