Only last argument logged after benchmark fails or times out

[sobuch]

Code starting at https://github.com/embench/embench-iot/blob/master/benchmark_speed.py#L204:

    if succeeded:
        return exec_time
    else:
        for arg in arglist:
            if arg == arglist[0]:
                comm = arg
            elif arg == '-ex':
                comm = ' ' + arg
            else:
                comm = " '" + arg + "'"

        log.debug('Args to subprocess:')
        log.debug(f'{comm}')

This results in logging only last argument passed to subprocess instead of all of them. I suppose it was intended to be like this (only difference is usage of '+='):

    if succeeded:
        return exec_time
    else:
        for arg in arglist:
            if arg == arglist[0]:
                comm = arg
            elif arg == '-ex':
                comm += ' ' + arg
            else:
                comm += " '" + arg + "'"

        log.debug('Args to subprocess:')
        log.debug(f'{comm}')