odhcpd: fix segfault when parsing domain options in UCI

git-svn-id: svn://svn.openwrt.org/openwrt/branches/barrier_breaker@42664 3c298f89-4303-0410-b956-a3cf2f4a3e73
odhcpd: fix segfault when parsing domain options in UCI

git-svn-id: svn://svn.openwrt.org/openwrt/branches/barrier_breaker@42664 3c298f89-4303-0410-b956-a3cf2f4a3e73
Merge branch 'master' of git://git.openwrt.org/14.07/openwrt