6relayd: Fix DHCPv6-PD with continuous hints

git-svn-id: svn://svn.openwrt.org/openwrt/trunk@37370 3c298f89-4303-0410-b956-a3cf2f4a3e73
netifd: Fix IPv6-prefix assignment with continuous hints

git-svn-id: svn://svn.openwrt.org/openwrt/trunk@37371 3c298f89-4303-0410-b956-a3cf2f4a3e73