patch 9.0.0338: return value of list_append_list() not always checked

Problem:    Return value of list_append_list() not always checked.
Solution:   Check return value and handle failure.

src/version.c

@@ -707,6 +707,8 @@ static char *(features[]) =
 
 static int included_patches[] =
 {   /* Add new patch number below this line */
+/**/
+    338,
 /**/
     337,
 /**/