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

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

Signed-off-by: Yang Hongyang <yanghy@cn.fujitsu.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
diff --git a/drivers/net/eql.c b/drivers/net/eql.c
index 51ead79..5210bb1 100644
--- a/drivers/net/eql.c
+++ b/drivers/net/eql.c
@@ -542,6 +542,8 @@
 	}
 	spin_unlock_bh(&eql->queue.lock);
 
+	dev_put(slave_dev);
+
 	return ret;
 }