yam driver null deref

[Dave Jones]

--- linux-2.6.5/drivers/net/hamradio/yam.c~	2004-04-16 22:24:00.000000000 +0100
+++ linux-2.6.5/drivers/net/hamradio/yam.c	2004-04-16 22:24:32.000000000 +0100
@@ -919,9 +919,12 @@
 static int yam_close(struct net_device *dev)
 {
 	struct sk_buff *skb;
-	struct yam_port *yp = (struct yam_port *) dev->priv;
+	struct yam_port *yp;
 
-	if (!dev || !yp)
+	if (!dev)
+		return -EINVAL;
+	yp = dev->priv;
+	if (!yp)
 		return -EINVAL;
 	/*
 	 * disable interrupts
-
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