stat: fix unified_rw_reporting=both BW and IOPS

When unified_rw_reporting=both, the value for the significant_figures
option is not populated in the struct thread_stat containing the mixed
r/w/t data. Thus, when bandwidth and IOPS numerical values are converted
to strings, they are converted to "0".

This patch populates the significant figures member of struct
thread_stat for the mixed r/w/t data.

Fixes: #1844
Signed-off-by: Vincent Fu <[email protected]>

stat.c

@@ -507,6 +507,7 @@ static struct thread_stat *gen_mixed_ddir_stats_from_ts(struct thread_stat *ts)
 	ts_lcl->slat_percentiles = ts->slat_percentiles;
 	ts_lcl->percentile_precision = ts->percentile_precision;
 	memcpy(ts_lcl->percentile_list, ts->percentile_list, sizeof(ts->percentile_list));
+	ts_lcl->sig_figs = ts->sig_figs;
 
 	sum_thread_stats(ts_lcl, ts);