Fix syntax error in tests/conftest.py

            # If the same bitstream is combined with the same error patterns multiple times, 

            # the following section may create a race condition. Hence, it is guarded by a 

            # lock and the file is only created if it does not exist already.

            lock.aquire()

            lock.acquire()

            try:

                if not os.path.exists(str(input_bitstream_path) + eid_output_suffix):

                    result = run(eid_command, check=True)