Calling l1ctl_server_shutdown() whenever the server is not initialized
will result in accessing uninitialized values. This can happen if we
goto exit before l1ctl_server_start() was called.
Initializing the server with zeroes is not an option, because we need
to initilize llist_head and osmo_fd structures with proper values.
Allocate and initialize struct l1ctl_server in l1ctl_server_start(),
deinitialize and free() in l1ctl_server_shutdown().
Change-Id: Idf13914fd0b0ae09b2ce5ece1f4203ebcae05d6e
Related: CID#275254
Vadim Yanitskiy
ae0bb5e1c7