[PATCH] staging: greybus: audio: Add missing unlock in gbaudio_dapm_free_controls()

[Wang Hai]

Add the missing unlock before return from function
gbaudio_dapm_free_controls() in the error handling case.

Fixes: 510e340efe0c ("staging: greybus: audio: Add helper APIs for dynamic audio module")
Reported-by: Hulk Robot <hulkci at huawei.com>
Signed-off-by: Wang Hai <wanghai38 at huawei.com>
---
 drivers/staging/greybus/audio_helper.c | 1 +
 1 file changed, 1 insertion(+)

diff --git a/drivers/staging/greybus/audio_helper.c b/drivers/staging/greybus/audio_helper.c
index 237531ba60f3..293675dbea10 100644
--- a/drivers/staging/greybus/audio_helper.c
+++ b/drivers/staging/greybus/audio_helper.c
@@ -135,6 +135,7 @@ int gbaudio_dapm_free_controls(struct snd_soc_dapm_context *dapm,
 		if (!w) {
 			dev_err(dapm->dev, "%s: widget not found\n",
 				widget->name);
+			mutex_unlock(&dapm->card->dapm_mutex);
 			return -EINVAL;
 		}
 		widget++;
-- 
2.17.1