Here's a few more commands.
# find the exact name of the xinetd package
$ rpm -qa | grep xinetd
# note the following is verify, if it returns nothing then
# it verifyied ok, if it prints an error then a file may have been deleted
$ rpm -V xinetd-2.3.13-4
# list the contents of the package
$ rpm -ql xinetd-2.3.13-4
... rest of the listing not shown ...
So the file /etc/rc.d/init.d/xinetd is the file from the package that somehow was deleted on your system?