perf stat: Move zero_per_pkg into counter process code

Moving zero_per_pkg into counter process code,
to make the reading path free of processing logic.

Signed-off-by: Jiri Olsa <jolsa@kernel.org>
Cc: Adrian Hunter <adrian.hunter@intel.com>
Cc: Andi Kleen <ak@linux.intel.com>
Cc: David Ahern <dsahern@gmail.com>
Cc: Namhyung Kim <namhyung@kernel.org>
Cc: Peter Zijlstra <a.p.zijlstra@chello.nl>
Cc: Stephane Eranian <eranian@google.com>
Link: http://lkml.kernel.org/r/1435310967-14570-17-git-send-email-jolsa@kernel.org
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>

tools/perf/builtin-stat.c

@@ -285,6 +285,9 @@ static int process_counter(struct perf_evsel *counter)
 
 	aggr->val = aggr->ena = aggr->run = 0;
 
+	if (counter->per_pkg)
+		zero_per_pkg(counter);
+
 	ret = process_counter_maps(counter);
 	if (ret)
 		return ret;
@@ -328,9 +331,6 @@ static int read_counter(struct perf_evsel *counter)
 	if (counter->system_wide)
 		nthreads = 1;
 
-	if (counter->per_pkg)
-		zero_per_pkg(counter);
-
 	for (thread = 0; thread < nthreads; thread++) {
 		for (cpu = 0; cpu < ncpus; cpu++) {
 			struct perf_counts_values *count;