am 0fa7ac9b: am 43122e7e: atrace: use creat instead of truncate

// Truncate a file.

static bool truncateFile(const char* path)

{

    int err = truncate(path, 0);

    if (err != 0) {

    // This uses creat rather than truncate because some of the debug kernel

    // device nodes (e.g. k_ftraceFilterPath) currently aren't changed by

    // calls to truncate, but they are cleared by calls to creat.

    int traceFD = creat(path, 0);

    if (traceFD == -1) {

        fprintf(stderr, "error truncating %s: %s (%d)\n", path,

            strerror(errno), errno);

        return false;

    }

    close(traceFD);

    return true;

}