[settings] Apply settings block name in register_settings()

Pass the settings block name as a parameter to register_settings(),
rather than defining it with settings_init() (and then possibly
changing it by directly manipulating settings->name).

Signed-off-by: Michael Brown <mcb30@ipxe.org>

src/net/dhcppkt.c

@@ -279,6 +279,5 @@ void dhcppkt_init ( struct dhcp_packet *dhcppkt, struct dhcphdr *data,
 	dhcppkt->len = ( offsetof ( struct dhcphdr, options ) +
 			 dhcppkt->options.len );
 	settings_init ( &dhcppkt->settings,
-			&dhcppkt_settings_operations, &dhcppkt->refcnt,
-			DHCP_SETTINGS_NAME, 0 );
+			&dhcppkt_settings_operations, &dhcppkt->refcnt, 0 );
 }