[PATCH] selftests:vm: use swap() to make code cleaner

[cgel . zte]

From: chiminghao <chi.minghao@xxxxxxxxxx>

Fix the following coccicheck REVIEW:
./tools/testing/selftests/vm/userfaultfd.c:1531:21-22:use swap() to make
code cleaner

Reported-by: Zeal Robot <zealci@xxxxxxxxxx>
Signed-off-by: chiminghao <chi.minghao@xxxxxxxxxx>
---
 tools/testing/selftests/vm/userfaultfd.c | 9 ++-------
 1 file changed, 2 insertions(+), 7 deletions(-)

diff --git a/tools/testing/selftests/vm/userfaultfd.c b/tools/testing/selftests/vm/userfaultfd.c
index 8a09057d2f22..dedbe9c9287e 100644
--- a/tools/testing/selftests/vm/userfaultfd.c
+++ b/tools/testing/selftests/vm/userfaultfd.c
@@ -1413,7 +1413,6 @@ static void userfaultfd_pagemap_test(unsigned int test_pgsize)
 static int userfaultfd_stress(void)
 {
 	void *area;
-	char *tmp_area;
 	unsigned long nr;
 	struct uffdio_register uffdio_register;
 	struct uffd_stats uffd_stats[nr_cpus];
@@ -1524,13 +1523,9 @@ static int userfaultfd_stress(void)
 					    count_verify[nr], nr);
 
 		/* prepare next bounce */
-		tmp_area = area_src;
-		area_src = area_dst;
-		area_dst = tmp_area;
+		swap(area_src, area_dst);
 
-		tmp_area = area_src_alias;
-		area_src_alias = area_dst_alias;
-		area_dst_alias = tmp_area;
+		swap(area_src_alias, area_dst_alias);
 
 		uffd_stats_report(uffd_stats, nr_cpus);
 	}
-- 
2.25.1