Memory leak with dynamic clients

[Jared Cantwell]

Thanks for the quick reply.  I think this approach is sufficient.  My
initial tests show that this change appears to have resolved our issue.  I
will perform more extensive testing over the coming days/weeks and report
back if I find any further issues.

Is there any reason these changes can't/shouldn't be made in client.c when
client_delete is called?  listen.c is the only caller, but I wonder if its
cleaner for client.c to handle the lifetime of the client after it's
deleted.

~Jared