Merge branch 'jk/ref-filter-segfault-fix'

A NULL-dereference bug has been corrected in an error codepath in
"git for-each-ref", "git branch --list" etc.

* jk/ref-filter-segfault-fix:
  ref-filter: fix NULL check for parse object failure

ref-filter.c

@@ -1608,7 +1608,7 @@ static int get_object(struct ref_array_item *ref, int deref, struct object **obj
 
 	if (oi->info.contentp) {
 		*obj = parse_object_buffer(the_repository, &oi->oid, oi->type, oi->size, oi->content, &eaten);
-		if (!obj) {
+		if (!*obj) {
 			if (!eaten)
 				free(oi->content);
 			return strbuf_addf_ret(err, -1, _("parse_object_buffer failed on %s for %s"),