[PATCH] selftests/core: Fix build issue with CLOSE_RANGE_UNSHARE

[Hu Yadi <hu.yadi@xxxxxxx>]

From: "Hu.Yadi" <hu.yadi@xxxxxxx>

Add head file to fix cpmpile error:

gcc -g -isystem /home/linux/usr/include     close_range_test.c  -o /home/linux/tools/testing/selftests/core/close_range_test
close_range_test.c: In function ‘close_range_unshare’:
close_range_test.c:111:11: error: ‘CLOSE_RANGE_UNSHARE’ undeclared (first use in this function); did you mean ‘CLONE_NEWUSER’?
           CLOSE_RANGE_UNSHARE);
           ^~~~~~~~~~~~~~~~~~~

Signed-off-by: Hu.Yadi <hu.yadi@xxxxxxx>
Suggested-by: Jiao <jiaoxupo@xxxxxxx>
Reviewed-by: Berlin <berlin@xxxxxxx>
---
 tools/testing/selftests/core/close_range_test.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/tools/testing/selftests/core/close_range_test.c b/tools/testing/selftests/core/close_range_test.c
index 534576f06df1..563bc1e55937 100644
--- a/tools/testing/selftests/core/close_range_test.c
+++ b/tools/testing/selftests/core/close_range_test.c
@@ -12,7 +12,7 @@
 #include <syscall.h>
 #include <unistd.h>
 #include <sys/resource.h>
-
+#include <linux/close_range.h>
 #include "../kselftest_harness.h"
 #include "../clone3/clone3_selftests.h"
 
-- 
2.23.0