umbim: remove superflous jshn call

Signed-off-by: John Crispin <blogic@openwrt.org>

git-svn-id: svn://svn.openwrt.org/openwrt/trunk@42467 3c298f89-4303-0410-b956-a3cf2f4a3e73

package/network/utils/umbim/files/lib/netifd/proto/mbim.sh

@@ -125,7 +125,6 @@ proto_mbim_setup() {
 	json_add_string name "${interface}_dhcpv6"
 	json_add_string ifname "@$interface"
 	json_add_string proto "dhcpv6"
-	json_close_object
 	ubus call network add_dynamic "$(json_dump)"
 }