perf script: Stop updating hists stats, not used

Not used here, remove to reduce perf_evsel/hists structs interaction.

Cc: Adrian Hunter <adrian.hunter@intel.com>
Cc: Borislav Petkov <bp@suse.de>
Cc: David Ahern <dsahern@gmail.com>
Cc: Don Zickus <dzickus@redhat.com>
Cc: Frederic Weisbecker <fweisbec@gmail.com>
Cc: Jean Pihet <jean.pihet@linaro.org>
Cc: Jiri Olsa <jolsa@redhat.com>
Cc: Mike Galbraith <efault@gmx.de>
Cc: Namhyung Kim <namhyung@kernel.org>
Cc: Paul Mackerras <paulus@samba.org>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Stephane Eranian <eranian@google.com>
Link: http://lkml.kernel.org/n/tip-zzmoo39yalrl9hzu9nc2xqml@git.kernel.orgSigned-off-by: NArnaldo Carvalho de Melo <acme@redhat.com>

tools/perf/builtin-script.c

@@ -572,7 +572,6 @@ static int process_sample_event(struct perf_tool *tool __maybe_unused,
 
 	scripting_ops->process_event(event, sample, evsel, thread, &al);
 
-	evsel->hists.stats.total_period += sample->period;
 	return 0;
 }