uwb: fix uwb_dev_unlock() missed at an error path in uwb_rc_cmd_async()

There is the only path in uwb_rc_cmd_async() where rc->uwb_dev is left unlocked.

Found by Linux Driver Verification project (linuxtesting.org).

Signed-off-by: Alexey Khoroshilov <[e-mail]>
Signed-off-by: Greg Kroah-Hartman <[e-mail]>

drivers/uwb/reset.c

···
 	neh = uwb_rc_neh_add(rc, cmd, expected_type, expected_event, cb, arg);
 	if (IS_ERR(neh)) {
 		result = PTR_ERR(neh);
+		uwb_dev_unlock(&rc->uwb_dev);
 		goto out;
 	}