[PATCH] ASoC: wm_adsp_fw_find_test: Fix missing NULL terminator on file name list

[Richard Fitzgerald <rf@opensource.cirrus.com>]

The array wm_adsp_fw_find_test_dir_all_files[] needs a NULL terminator.

It was documented at line 41 that dir_files points to a NULL-terminated
array.

   /* NULL-terminated array of pointers to filenames ... <snip> */
   const char * const *dir_files;

This fixes the error reported by KASAN:

[17:46:43] BUG: KASAN: global-out-of-bounds in
  wm_adsp_fw_find_test_pick_file+0x8cc/0xc80
[17:46:43] Read of size 8 at addr ffff800081e5ffe8 by task
  kunit_try_catch/18349

Signed-off-by: Richard Fitzgerald <rf@opensource.cirrus.com>
Fixes: bf2d44d07de7 ("ASoC: wm_adsp: Add kunit test for firmware file search")
---
 sound/soc/codecs/wm_adsp_fw_find_test.c | 1 +
 1 file changed, 1 insertion(+)

diff --git a/sound/soc/codecs/wm_adsp_fw_find_test.c b/sound/soc/codecs/wm_adsp_fw_find_test.c
index fb886dc61c27..d0c7fb30a95d 100644
--- a/sound/soc/codecs/wm_adsp_fw_find_test.c
+++ b/sound/soc/codecs/wm_adsp_fw_find_test.c
@@ -1041,6 +1041,7 @@ static const char * const wm_adsp_fw_find_test_dir_all_files[] = {
 	"cirrus/cs1234-dsp1-mbc-vss.bin",
 	"cirrus/wm1234-dsp1-mbc-vss.bin",
 	"wm1234-dsp1-mbc-vss.bin",
+	NULL /* terminator */
 };
 
 /*
-- 
2.47.3