bpo-39573: Finish converting to new Py_IS_TYPE() macro (GH-18601)

diff --git a/Modules/_io/bufferedio.c b/Modules/_io/bufferedio.c
index a09082c..f2d0467 100644
--- a/Modules/_io/bufferedio.c
+++ b/Modules/_io/bufferedio.c
@@ -1449,8 +1449,8 @@
         return -1;
     _bufferedreader_reset_buf(self);
 
-    self->fast_closed_checks = (Py_TYPE(self) == &PyBufferedReader_Type &&
-                                Py_TYPE(raw) == &PyFileIO_Type);
+    self->fast_closed_checks = (Py_IS_TYPE(self, &PyBufferedReader_Type) &&
+                                Py_IS_TYPE(raw, &PyFileIO_Type));
 
     self->ok = 1;
     return 0;
@@ -1795,8 +1795,8 @@
     _bufferedwriter_reset_buf(self);
     self->pos = 0;
 
-    self->fast_closed_checks = (Py_TYPE(self) == &PyBufferedWriter_Type &&
-                                Py_TYPE(raw) == &PyFileIO_Type);
+    self->fast_closed_checks = (Py_IS_TYPE(self, &PyBufferedWriter_Type) &&
+                                Py_IS_TYPE(raw, &PyFileIO_Type));
 
     self->ok = 1;
     return 0;
@@ -2309,8 +2309,8 @@
     _bufferedwriter_reset_buf(self);
     self->pos = 0;
 
-    self->fast_closed_checks = (Py_TYPE(self) == &PyBufferedRandom_Type &&
-                                Py_TYPE(raw) == &PyFileIO_Type);
+    self->fast_closed_checks = (Py_IS_TYPE(self, &PyBufferedRandom_Type) &&
+                                Py_IS_TYPE(raw, &PyFileIO_Type));
 
     self->ok = 1;
     return 0;