[PATCH] perf cs-etm: Use swap() instead of open coding it

[Jiapeng Chong]

Clean the following coccicheck warning:

./tools/perf/util/cs-etm.c:418:34-35: WARNING opportunity for swap().

Reported-by: Abaci Robot <abaci at linux.alibaba.com>
Signed-off-by: Jiapeng Chong <jiapeng.chong at linux.alibaba.com>
---
 tools/perf/util/cs-etm.c | 9 ++-------
 1 file changed, 2 insertions(+), 7 deletions(-)

diff --git a/tools/perf/util/cs-etm.c b/tools/perf/util/cs-etm.c
index 8b95fb3c4d7b..0cb555cc766f 100644
--- a/tools/perf/util/cs-etm.c
+++ b/tools/perf/util/cs-etm.c
@@ -406,18 +406,13 @@ struct cs_etm_packet_queue
 static void cs_etm__packet_swap(struct cs_etm_auxtrace *etm,
 				struct cs_etm_traceid_queue *tidq)
 {
-	struct cs_etm_packet *tmp;
-
 	if (etm->synth_opts.branches || etm->synth_opts.last_branch ||
-	    etm->synth_opts.instructions) {
+	    etm->synth_opts.instructions)
 		/*
 		 * Swap PACKET with PREV_PACKET: PACKET becomes PREV_PACKET for
 		 * the next incoming packet.
 		 */
-		tmp = tidq->packet;
-		tidq->packet = tidq->prev_packet;
-		tidq->prev_packet = tmp;
-	}
+		swap(tidq->packet, tidq->prev_packet);
 }
 
 static void cs_etm__packet_dump(const char *pkt_string)
-- 
2.20.1.7.g153144c