[PATCH v4 2/2] drm/nouveau: Fix memory leak in hwmon init error path

[liupeng]

In nouveau_hwmon_init(), if hwmon_device_register_with_info() fails,
the allocated hwmon structure is leaked because the function returns
the error code directly.

Fix this by freeing the allocated memory and clearing the pointer on
the error path.

Fixes: b9ed919f1c8f ("drm/nouveau/drm/pm: remove everything except the hwmon interfaces to THERM")
Cc: stable@xxxxxxxxxxxxxxx
Reviewed-by: Lyude Paul <lyude@xxxxxxxxxx>
Signed-off-by: liupeng <liupeng01@xxxxxxxxxx>
---
Changes in v4:
- Split the debugfs and hwmon fixes into two separate patches as
  requested by Danilo, since they are unrelated fixes with different
  Fixes: tags. No functional change to this fix.

 drivers/gpu/drm/nouveau/nouveau_hwmon.c | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/drivers/gpu/drm/nouveau/nouveau_hwmon.c b/drivers/gpu/drm/nouveau/nouveau_hwmon.c
index 726397ab035d..ffbe7f542ab0 100644
--- a/drivers/gpu/drm/nouveau/nouveau_hwmon.c
+++ b/drivers/gpu/drm/nouveau/nouveau_hwmon.c
@@ -697,6 +697,8 @@ nouveau_hwmon_init(struct drm_device *dev)
 	if (IS_ERR(hwmon_dev)) {
 		ret = PTR_ERR(hwmon_dev);
 		NV_ERROR(drm, "Unable to register hwmon device: %d\n", ret);
+		drm->hwmon = NULL;
+		kfree(hwmon);
 		return ret;
 	}
 
-- 
2.53.0