Various drivers' irq handlers: kill dead code, needless casts

- Eliminate casts to/from void*

- Eliminate checks for conditions that never occur.  These typically
  fall into two classes:

	1) Checking for 'dev_id == NULL', then it is never called with
	NULL as an argument.

	2) Checking for invalid irq number, when the only caller (the
	system) guarantees the irq handler is called with the proper
	'irq' number argument.

Signed-off-by: Jeff Garzik <jeff@garzik.org>

sound/isa/gus/gusmax.c

@@ -107,7 +107,7 @@ static int __init snd_gusmax_detect(struct snd_gus_card * gus)
 
 static irqreturn_t snd_gusmax_interrupt(int irq, void *dev_id)
 {
-	struct snd_gusmax *maxcard = (struct snd_gusmax *) dev_id;
+	struct snd_gusmax *maxcard = dev_id;
 	int loop, max = 5;
 	int handled = 0;