tx2mon on OVIS-4 references sampler base log pointer

[baallan]

  CC       tx2mon.lo
../../../../../ldms/src/sampler/tx2mon/tx2mon.c: In function 'create_metric_set':
../../../../../ldms/src/sampler/tx2mon/tx2mon.c:417:8: error: 'struct base_data_s' has no member named 'log'
    base->log(OVIS_LERROR,"base_set_new: ldms_set_publish failed for %s\n",

[tom95858]

@baallan, why open an issue instead of just fixing it?

[baallan]

@tom95858 i didn't refactor the sampler for ovis_log and am buried in other year-end activities. this bug breaks the build on aarch64 where tx2mon is present.