I obtained the sysvinit-2.89.tar.bz2 and corresponding sysvinit-2.89.tar.bz2.sig from savannah. I find that the signature file was produced using RSA key 2A72EB41906F8E49, which doesn't appear to be in the project members' GPG keyring available at
http://savannah.nongnu.org/project/memberlist-gpgkeys.php?group=sysvinit and isn't available in the SKS keyserver network.