bpo-33029: Fix signatures of getter and setter functions. (GH-10746)


Fix also return type for few other functions (clear, releasebuffer).
(cherry picked from commit d4f9cf5545d6d8844e0726552ef2e366f5cc3abd)

Co-authored-by: Serhiy Storchaka <storchaka@gmail.com>
diff --git a/Modules/mmapmodule.c b/Modules/mmapmodule.c
index ba42f73..f957e2c 100644
--- a/Modules/mmapmodule.c
+++ b/Modules/mmapmodule.c
@@ -653,7 +653,7 @@
 }
 
 static PyObject *
-mmap_closed_get(mmap_object *self)
+mmap_closed_get(mmap_object *self, void *Py_UNUSED(ignored))
 {
 #ifdef MS_WINDOWS
     return PyBool_FromLong(self->map_handle == NULL ? 1 : 0);