6in4: work around hanging wget process

git-svn-id: svn://svn.openwrt.org/openwrt/trunk@35408 3c298f89-4303-0410-b956-a3cf2f4a3e73
6in4: fix typo in last commit

git-svn-id: svn://svn.openwrt.org/openwrt/trunk@35409 3c298f89-4303-0410-b956-a3cf2f4a3e73