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>

drivers/serial/jsm/jsm_neo.c

@@ -1116,7 +1116,7 @@ static void neo_param(struct jsm_channel *ch)
  */
 static irqreturn_t neo_intr(int irq, void *voidbrd)
 {
-	struct jsm_board *brd = (struct jsm_board *) voidbrd;
+	struct jsm_board *brd = voidbrd;
 	struct jsm_channel *ch;
 	int port = 0;
 	int type = 0;