drivers/net/eql.c: Fix a dev leakage.

After dev_get_by_name(), we should follow a dev_put().

Signed-off-by: Yang Hongyang <[e-mail]>
Signed-off-by: David S. Miller <[e-mail]>

drivers/net/eql.c

···
 	}
 	spin_unlock_bh(&eql->queue.lock);
 
+	dev_put(slave_dev);
+
 	return ret;
 }