doveadm: client: Set IO only after enabling SSL

io_add_istream() needs to be used with the SSL istream, otherwise it can
cause hangs.

src/doveadm/server-connection.c

@@ -544,7 +544,6 @@ int server_connection_create(struct doveadm_server *server,
 						     doveadm_settings->doveadm_port);
 	net_set_nonblock(conn->fd, TRUE);
 	conn->input = i_stream_create_fd(conn->fd, MAX_INBUF_SIZE);
-	conn->io = io_add_istream(conn->input, server_connection_input, conn);
 	conn->output = o_stream_create_fd(conn->fd, (size_t)-1);
 	o_stream_set_flush_callback(conn->output, server_connection_output, conn);
 	o_stream_set_no_error_handling(conn->output, TRUE);
@@ -559,6 +558,7 @@ int server_connection_create(struct doveadm_server *server,
 		server_connection_destroy(&conn);
 		return -1;
 	}
+	conn->io = io_add_istream(conn->input, server_connection_input, conn);
 
 	conn->state = SERVER_REPLY_STATE_DONE;
 	o_stream_nsend_str(conn->output, DOVEADM_SERVER_PROTOCOL_VERSION_LINE"\n");