perf evsel: Rearrange perf_evsel__config_leader_sampling()

In preparation for adding support for leader sampling with AUX area events.
Signed-off-by: Adrian Hunter <adrian.hunter@intel.com>
Cc: Andi Kleen <ak@linux.intel.com>
Cc: Jiri Olsa <jolsa@redhat.com>
Link: http://lore.kernel.org/lkml/20200401101613.6201-15-adrian.hunter@intel.comSigned-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>

tools/perf/util/record.c

@@ -172,24 +172,24 @@ static void perf_evsel__config_leader_sampling(struct evsel *evsel)
 	struct perf_event_attr *attr = &evsel->core.attr;
 	struct evsel *leader = evsel->leader;
 
+	if (leader == evsel || !leader->sample_read)
+		return;
+
 	/*
 	 * Disable sampling for all group members other
 	 * than leader in case leader 'leads' the sampling.
 	 */
-	if (leader != evsel && leader->sample_read) {
 	attr->freq           = 0;
 	attr->sample_freq    = 0;
 	attr->sample_period  = 0;
 	attr->write_backward = 0;
 
 	/*
-		 * We don't get sample for slave events, we make them
-		 * when delivering group leader sample. Set the slave
-		 * event to follow the master sample_type to ease up
-		 * report.
+	 * We don't get a sample for slave events, we make them when delivering
+	 * the group leader sample. Set the slave event to follow the master
+	 * sample_type to ease up reporting.
 	 */
 	attr->sample_type = leader->core.attr.sample_type;
-	}
 }
 
 void perf_evlist__config(struct evlist *evlist, struct record_opts *opts,