doveadm-server: Deinitialize log proxying before closing SSL iostream

Otherwise the SSL iostream destroying may trigger debug/error logging,
which attempts to proxy logs when the stream is already closed. This
caused a panic.

src/doveadm/client-connection-tcp.c

@@ -597,13 +597,12 @@ client_connection_tcp_free(struct client_connection *_conn)
 	doveadm_print_deinit();
 	doveadm_print_ostream = NULL;
 
-	if (conn->ssl_iostream != NULL)
-		ssl_iostream_destroy(&conn->ssl_iostream);
-
 	if (conn->log_out != NULL) {
 		doveadm_server_restore_logs();
 		o_stream_unref(&conn->log_out);
 	}
+	if (conn->ssl_iostream != NULL)
+		ssl_iostream_destroy(&conn->ssl_iostream);
 
 	io_remove(&conn->io);
 	o_stream_destroy(&conn->output);