modemmanger: add missing proto_init_update in teardown

Inform netifd with missing 'proto_update', that the interface is not
up anymore.

Signed-off-by: Florian Eckert <fe@dev.tdt.de>

net/modemmanager/Makefile

@@ -9,7 +9,7 @@ include $(TOPDIR)/rules.mk
 
 PKG_NAME:=modemmanager
 PKG_SOURCE_VERSION:=1.20.6
-PKG_RELEASE:=5
+PKG_RELEASE:=6
 
 PKG_SOURCE_PROTO:=git
 PKG_SOURCE_URL:=https://gitlab.freedesktop.org/mobile-broadband/ModemManager.git

net/modemmanager/files/modemmanager.proto

@@ -539,6 +539,9 @@ proto_modemmanager_teardown() {
 	# low power, only if requested
 	[ "${lowpower:-0}" -lt 1 ] ||
 		mmcli --modem="${device}" --set-power-state-low
+
+	proto_init_update "*" 0
+	proto_send_update "$interface"
 }
 
 [ -n "$INCLUDE_ONLY" ] || {