[PATCH] ASoC: wm_adsp: Fix crash in kunit tests on arm64

[Charles Keepax <ckeepax@opensource.cirrus.com>]

Several of the wm_adsp kunit tests failed by only on arm64. This
turns out to be passing things to release_firmware which were not
allocated with request_firmware. This does actually drop some
errors on other platforms but somehow doesn't cause the tests to
fail, and kunit hides a lot of the output for passing tests.

There is a comment in the code regarding this exact thing in
wm_adsp_fw_find_test_case_exit(), but then it goes on and
does it anyway. I suspect maybe there was a plan to override
wm_adsp_release_firmware_files() that got forgotten, as the
function appears to have hooks for kunit that aren't used. Anyway
for now implement a simple fix of freeing the filenames
locally. It is likely a more detailed fix will be implemented in
the near future but this should get things moving again.

Fixes: bf2d44d07de7 ("ASoC: wm_adsp: Add kunit test for firmware file search")
Signed-off-by: Charles Keepax <ckeepax@opensource.cirrus.com>
---
 sound/soc/codecs/wm_adsp_fw_find_test.c | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/sound/soc/codecs/wm_adsp_fw_find_test.c b/sound/soc/codecs/wm_adsp_fw_find_test.c
index 44c26e991b359..fb886dc61c27a 100644
--- a/sound/soc/codecs/wm_adsp_fw_find_test.c
+++ b/sound/soc/codecs/wm_adsp_fw_find_test.c
@@ -262,7 +262,8 @@ static void wm_adsp_fw_find_test_case_exit(struct kunit *test)
 	 * dummies not allocated by the real request_firmware() call they
 	 * must not be passed to release_firmware().
 	 */
-	wm_adsp_release_firmware_files(&priv->found_fw);
+	kfree(priv->found_fw.wmfw.filename);
+	kfree(priv->found_fw.coeff.filename);
 }
 
 static void wm_adsp_fw_find_test_param_desc(const struct wm_adsp_fw_find_test_params *param,
-- 
2.47.3