Ensure that the sender turns off any msg_fd_in use earlier.

This avoids a problem where an extra message from the sender
could give the generator time to start sending data that will
not be understood by the sender's use of read_msg_fd().

flist.c

@@ -2262,6 +2262,8 @@ struct file_list *send_file_list(int f, int argc, char *argv[])
 	if (numeric_ids <= 0 && !inc_recurse)
 		send_id_list(f);
 
+	set_msg_fd_in(-1);
+
 	/* send the io_error flag */
 	if (protocol_version < 30)
 		write_int(f, ignore_errors ? 0 : io_error);

main.c

@@ -1091,7 +1091,6 @@ int client_run(int f_in, int f_out, pid_t pid, int argc, char *argv[])
 		if (write_batch && !am_server)
 			start_write_batch(f_out);
 		flist = send_file_list(f_out, argc, argv);
-		set_msg_fd_in(-1);
 		if (DEBUG_GTE(FLIST, 3))
 			rprintf(FINFO,"file list sent\n");