fix error if dhcp is disabled

git-svn-id: svn://svn.openwrt.org/openwrt/branches/buildroot-ng/openwrt@4545 3c298f89-4303-0410-b956-a3cf2f4a3e73

package/dnsmasq/files/dnsmasq.conf

@@ -12,15 +12,13 @@ resolv-file=/tmp/resolv.conf
 
 @ifdef dhcp_enable
 dhcp-range=@@start@@,@@end@@,@@netmask@@,@@lease@@
+dhcp-authoritative
+dhcp-leasefile=/tmp/dhcp.leases
 @endif
 @ifdef wan_ifname
 except-interface=@@wan_ifname@@
 @endif
 
-# enable dhcp (start,end,netmask,leasetime)
-dhcp-authoritative
-dhcp-leasefile=/tmp/dhcp.leases
-
 # use /etc/ethers for static hosts; same format as --dhcp-host
 # <hwaddr> <ipaddr>
 read-ethers