sm-notify command: getaddrinfo(3) addrinfo leak

Make sure the results of getaddrinfo(3) are properly freed in notify().

Note this is a one-time addrinfo allocation that would be automatically
freed when sm-notify exits anyway, so this is more of a nit than a real
bug fix.

Signed-off-by: Chuck Lever <chuck.lever@oracle.com>
Signed-off-by: Steve Dickson <steved@redhat.com>