Issue #28999: Use Py_RETURN_NONE, Py_RETURN_TRUE and Py_RETURN_FALSE wherever
possible.  Patch is writen with Coccinelle.
diff --git a/Python/import.c b/Python/import.c
index aef1800..38976f6 100644
--- a/Python/import.c
+++ b/Python/import.c
@@ -260,8 +260,7 @@
 #ifdef WITH_THREAD
     _PyImport_AcquireLock();
 #endif
-    Py_INCREF(Py_None);
-    return Py_None;
+    Py_RETURN_NONE;
 }
 
 /*[clinic input]
@@ -283,8 +282,7 @@
         return NULL;
     }
 #endif
-    Py_INCREF(Py_None);
-    return Py_None;
+    Py_RETURN_NONE;
 }
 
 void
@@ -1853,8 +1851,7 @@
     if (ret < 0)
         return NULL;
     if (ret == 0) {
-        Py_INCREF(Py_None);
-        return Py_None;
+        Py_RETURN_NONE;
     }
     m = PyImport_AddModuleObject(name);
     Py_XINCREF(m);