perf db-export: Export comm before exporting thread

Export comm before exporting the non-main thread because
db_export__thread() also exports the comm_thread.
Signed-off-by: Adrian Hunter <adrian.hunter@intel.com>
Cc: Jiri Olsa <jolsa@redhat.com>
Link: http://lkml.kernel.org/r/20190710085810.1650-6-adrian.hunter@intel.comSigned-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>

tools/perf/util/db-export.c

@@ -312,6 +312,12 @@ int db_export__sample(struct db_export *dbe, union perf_event *event,
 					main_thread);
 		if (err)
 			goto out_put;
+		if (comm) {
+			err = db_export__exec_comm(dbe, comm, main_thread);
+			if (err)
+				goto out_put;
+			es.comm_db_id = comm->db_id;
+		}
 	}
 
 	if (thread != main_thread) {
@@ -321,13 +327,6 @@ int db_export__sample(struct db_export *dbe, union perf_event *event,
 			goto out_put;
 	}
 
-	if (comm) {
-		err = db_export__exec_comm(dbe, comm, main_thread);
-		if (err)
-			goto out_put;
-		es.comm_db_id = comm->db_id;
-	}
-
 	es.db_id = ++dbe->sample_last_db_id;
 
 	err = db_ids_from_al(dbe, al, &es.dso_db_id, &es.sym_db_id, &es.offset);