* Close the file descriptor given by \a sc, remove it from the close-on-fork
* list, destroy the chunk queue of this client, delete the client from the
* list of connected clients and free the sender_client struct.
* Close the file descriptor given by \a sc, remove it from the close-on-fork
* list, destroy the chunk queue of this client, delete the client from the
* list of connected clients and free the sender_client struct.