[RFC PATCH mcgrof] selftests: first_test_dev can be static

[kernel test robot]

lib/test_sysfs.c:148:26: warning: symbol 'first_test_dev' was not declared. Should it be static?

Fixes: ed2111f617d4 ("selftests: add tests_sysfs module")
Reported-by: kernel test robot <lkp@xxxxxxxxx>
Signed-off-by: kernel test robot <lkp@xxxxxxxxx>
---
 test_sysfs.c |    2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/lib/test_sysfs.c b/lib/test_sysfs.c
index f8935bd678b12..273fc3f397401 100644
--- a/lib/test_sysfs.c
+++ b/lib/test_sysfs.c
@@ -145,7 +145,7 @@ struct sysfs_test_device {
 	int y;
 };
 
-struct sysfs_test_device *first_test_dev;
+static struct sysfs_test_device *first_test_dev;
 
 static struct miscdevice *dev_to_misc_dev(struct device *dev)
 {