driver core: replace open-coded device_lock_assert()

Using the right wrapper makes it easier to associate this assert
statement with the device_[un]lock() helpers.

Signed-off-by: Julian Wiedmann <jwi@linux.ibm.com>
Link: https://lore.kernel.org/r/20210512141054.2180373-1-jwi@linux.ibm.com
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

drivers/base/core.c

@@ -3437,7 +3437,7 @@ bool kill_device(struct device *dev)
 	 * to run while we are tearing out the bus/class/sysfs from
 	 * underneath the device.
 	 */
-	lockdep_assert_held(&dev->mutex);
+	device_lock_assert(dev);
 
 	if (dev->p->dead)
 		return false;