rem: exit_cleanup(1);
add: exit_cleanup(RERR_PROTOCOL);
context: void setup_protocol(int f_out,int f_in){	if (remote_version == 0) {		if (am_server) {			remote_version = read_int(f_in);			write_int(f_out,PROTOCOL_VERSION);		} else {			write_int(f_out,PROTOCOL_VERSION);			remote_version = read_int(f_in);		}	}	if (remote_version < MIN_PROTOCOL_VERSION ||	    remote_version > MAX_PROTOCOL_VERSION) {		rprintf(FERROR,"protocol version mismatch - is your shell clean?\n");		rprintf(FERROR,"(see the rsync man page for an explanation)\n");		exit_cleanup(1);	}			if (verbose > 2)		rprintf(FINFO, "local_version=%d remote_version=%d\n",			PROTOCOL_VERSION, remote_version);		if (remote_version >= 12) {		if (am_server) {			checksum_seed = time(NULL);			write_int(f_out,checksum_seed);		} else {			checksum_seed = read_int(f_in);		}	}		checksum_init();}