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>

1 files changed, 3 insertions, 4 deletions

diff --git a/drivers/char/riscom8.c b/drivers/char/riscom8.c
index be68cfb0ae69..5ab32b38f45a 100644
--- a/drivers/char/riscom8.c
+++ b/drivers/char/riscom8.c
@@ -559,11 +559,10 @@ static irqreturn_t rc_interrupt(int irq, void * dev_id)
         int handled = 0;
 
         bp = IRQ_to_board[irq];
-        
-        if (!bp || !(bp->flags & RC_BOARD_ACTIVE))  {
+
+        if (!(bp->flags & RC_BOARD_ACTIVE))
                 return IRQ_NONE;
-        }
-        
+
         while ((++loop < 16) && ((status = ~(rc_in(bp, RC_BSR))) &
                                  (RC_BSR_TOUT | RC_BSR_TINT |
                                   RC_BSR_MINT | RC_BSR_RINT))) {