[netdrvr] irq handler minor cleanups in several drivers

* use irq_handler_t where appropriate

* no need to use 'irq' function arg, its already stored in a data struct

* rename irq handler 'irq' argument to 'dummy', where the function
  has been analyzed and proven not to use its first argument.

* remove always-false "dev_id == NULL" test from irq handlers

* remove pointless casts from void*

* declance: irq argument is not const

* add KERN_xxx printk prefix

* fix minor whitespace weirdness

Signed-off-by: Jeff Garzik <jgarzik@redhat.com>
diff --git a/drivers/net/wan/sdla.c b/drivers/net/wan/sdla.c
index 05df0a3..73e2f27 100644
--- a/drivers/net/wan/sdla.c
+++ b/drivers/net/wan/sdla.c
@@ -867,7 +867,7 @@
 	spin_unlock_irqrestore(&sdla_lock, flags);
 }
 
-static irqreturn_t sdla_isr(int irq, void *dev_id)
+static irqreturn_t sdla_isr(int dummy, void *dev_id)
 {
 	struct net_device     *dev;
 	struct frad_local *flp;
@@ -879,7 +879,8 @@
 
 	if (!flp->initialized)
 	{
-		printk(KERN_WARNING "%s: irq %d for uninitialized device.\n", dev->name, irq);
+		printk(KERN_WARNING "%s: irq %d for uninitialized device.\n",
+		       dev->name, dev->irq);
 		return IRQ_NONE;
 	}