Merge branch 'maint'

* maint:
git-for-each-ref.txt: minor improvements
name-rev: Fix segmentation fault when using --all

diff --combined builtin-name-rev.c
index cde5de56fa43c1552722965343867b2baaebdaf4,521f061c9e5dfa2aecc22758353bd7bd67e34121..f153da012f4e89ff8744ede70911cd4690de79b2
--- 1/builtin-name-rev.c
--- 2/builtin-name-rev.c
+++ b/builtin-name-rev.c
@@@ -195,7 -195,7 +195,7 @@@ int cmd_name_rev(int argc, const char *
                OPT_END(),
        };
  
 -      git_config(git_default_config);
 +      git_config(git_default_config, NULL);
        argc = parse_options(argc, argv, opts, name_rev_usage, 0);
        if (!!all + !!transform_stdin + !!argc > 1) {
                error("Specify either a list, or --all, not both!");
@@@ -280,9 -280,13 +280,13 @@@
                int i, max;
  
                max = get_max_object_index();
-               for (i = 0; i < max; i++)
-                       show_name(get_indexed_object(i), NULL,
+               for (i = 0; i < max; i++) {
+                       struct object *obj = get_indexed_object(i);
+                       if (!obj)
+                               continue;
+                       show_name(obj, NULL,
                                  always, allow_undefined, data.name_only);
+               }
        } else {
                int i;
                for (i = 0; i < revs.nr; i++)