[PATCH] fix AUDIT_FILTER_PREPEND handling

Clear AUDIT_FILTER_PREPEND flag after adding rule to list.  This
fixes three problems when a rule is added with the -A syntax:

    - auditctl displays filter list as "(null)"
    - the rule cannot be removed using -d
    - a duplicate rule can be added with -a
Signed-off-by: NAmy Griffis <amy.griffis@hp.com>
Signed-off-by: NAl Viro <viro@zeniv.linux.org.uk>

kernel/auditfilter.c

@@ -1083,6 +1083,7 @@ static inline int audit_add_rule(struct audit_entry *entry,
 
 	if (entry->rule.flags & AUDIT_FILTER_PREPEND) {
 		list_add_rcu(&entry->list, list);
+		entry->rule.flags &= ~AUDIT_FILTER_PREPEND;
 	} else {
 		list_add_tail_rcu(&entry->list, list);
 	}