audit: correct AUDIT_GET_FEATURE return message type

commit 9ef91514 upstream.

When an AUDIT_GET_FEATURE message is sent from userspace to the kernel, it
should reply with a message tagged as an AUDIT_GET_FEATURE type with a struct
audit_feature.  The current reply is a message tagged as an AUDIT_GET
type with a struct audit_feature.

This appears to have been a cut-and-paste-eo in commit b0fed402.
Reported-by: Steve Grubb <sgrubb@redhat.com>
Signed-off-by: Richard Guy Briggs <rgb@redhat.com>
Signed-off-by: Luis Henriques <luis.henriques@canonical.com>

kernel/audit.c

@@ -724,7 +724,7 @@ static int audit_get_feature(struct sk_buff *skb)
 
 	seq = nlmsg_hdr(skb)->nlmsg_seq;
 
-	audit_send_reply(skb, seq, AUDIT_GET, 0, 0, &af, sizeof(af));
+	audit_send_reply(skb, seq, AUDIT_GET_FEATURE, 0, 0, &af, sizeof(af));
 
 	return 0;
 }