Same problem here (running Debian Squeeze), I regularly see lots of messages like:
Nov 1 15:49:22 mosquito dnsmasq-dhcp[17144]: DHCPNAK(vlan3) 192.168.1.171
00:1f:1f:02:74:81 wrong server-ID
Correct fix for logcheck seems to be this line:
^\w{3} [ :0-9]{11} [._[:alnum:]-]+ dnsmasq-dhcp\[[0-9]+\]:
DHCPNAK\([.[:alnum:]]+\) [.[:digit:]]{7,15} [:[:xdigit:]]{17} wrong server-ID$
cheers,
David
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