[PATCH] ext4: Fix sparse warning in extents kunit test when EXT4_KUNIT_TESTS=m

[Ojaswin Mujoo]

When kunit tests are compiled as modules, the extents kunit test emits
a sparse warning:

>> fs/ext4/extents-test.c:59:3: sparse: sparse: symbol 'k_ctx' was not
   declared. Should it be static?

Fix this by declaring it as static.

Fixes: cb1e0c1d1fad ("ext4: kunit tests for extent splitting and conversion")
Reported-by: kernel test robot <lkp@xxxxxxxxx>
Closes: https://lore.kernel.org/oe-kbuild-all/202609221900.Pgwrcp41-lkp@xxxxxxxxx/
---
 fs/ext4/extents-test.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/fs/ext4/extents-test.c b/fs/ext4/extents-test.c
index bd7795a82607..9669b2197fca 100644
--- a/fs/ext4/extents-test.c
+++ b/fs/ext4/extents-test.c
@@ -48,7 +48,7 @@
 #define EXT_DATA_LBLK 10
 #define EXT_DATA_LEN 3
 
-struct kunit_ctx {
+static struct kunit_ctx {
 	/*
 	 * Ext4 inode which has only 1 unwrit extent
 	 */
-- 
2.55.0