most: usb: hdm_probe: Fix calling put_device() before device initialization

The early error path in hdm_probe() can jump to err_free_mdev before
&mdev->dev has been initialized with device_initialize(). Calling
put_device(&mdev->dev) there triggers a device core WARN and ends up
invoking kref_put(&kobj->kref, kobject_release) on an uninitialized
kobject.

In this path the private struct was only kmalloc'ed and the intended
release is effectively kfree(mdev) anyway, so free it directly instead
of calling put_device() on an uninitialized device.

This removes the WARNING and fixes the pre-initialization error path.

Fixes: 97a6f772f3 ("drivers: most: add USB adapter driver")
Cc: stable <[email protected]>
Signed-off-by: Victoria Votokina <[email protected]>
Link: https://patch.msgid.link/[email protected]
Signed-off-by: Greg Kroah-Hartman <[email protected]>

drivers/most/most_usb.c

@@ -1097,7 +1097,7 @@ err_free_cap:
 err_free_conf:
 	kfree(mdev->conf);
 err_free_mdev:
-	put_device(&mdev->dev);
+	kfree(mdev);
 	return ret;
 }