uwb: stop uwbd thread if rc->start() fails

This fixes an oops when uwbd thread continues running after a failed
radio controller start.
Signed-off-by: David Vrabel <david.vrabel@csr.com>

drivers/uwb/lc-rc.c

@@ -288,8 +288,8 @@ int uwb_rc_add(struct uwb_rc *rc, struct device *parent_dev, void *priv)
 error_dev_add:
 error_rc_setup:
 	rc->stop(rc);
-	uwbd_stop(rc);
 error_rc_start:
+	uwbd_stop(rc);
 	return result;
 }
 EXPORT_SYMBOL_GPL(uwb_rc_add);