patch 9.0.0970: Coverity warns for uninitialized variable

Problem:    Coverity warns for uninitialized variable.
Solution:   Initialize "ren_ret".
diff --git a/src/if_py_both.h b/src/if_py_both.h
index 0cde18d..5589af6 100644
--- a/src/if_py_both.h
+++ b/src/if_py_both.h
@@ -5274,7 +5274,7 @@
     {
 	char_u		*val;
 	aco_save_T	aco;
-	int		ren_ret;
+	int		ren_ret = OK;
 	PyObject	*todecref;
 
 	if (!(val = StringToChars(valObject, &todecref)))
diff --git a/src/version.c b/src/version.c
index 78df0d8..7ac20cd 100644
--- a/src/version.c
+++ b/src/version.c
@@ -696,6 +696,8 @@
 static int included_patches[] =
 {   /* Add new patch number below this line */
 /**/
+    970,
+/**/
     969,
 /**/
     968,