drivers/net: eliminate irq handler impossible checks, needless casts

- Eliminate check for irq handler 'dev_id==NULL' where the
  condition never occurs.

- Eliminate needless casts to/from void*

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

1 files changed, 0 insertions, 5 deletions

diff --git a/drivers/net/znet.c b/drivers/net/znet.c
index 2068a109a86c..b24b0727108c 100644
--- a/drivers/net/znet.c
+++ b/drivers/net/znet.c
@@ -610,11 +610,6 @@ static irqreturn_t znet_interrupt(int irq, void *dev_id)
         int boguscnt = 20;
         int handled = 0;
 
-        if (dev == NULL) {
-                printk(KERN_WARNING "znet_interrupt(): IRQ %d for unknown device.\n", irq);
-                return IRQ_NONE;
-        }
-
         spin_lock (&znet->lock);
 
         ioaddr = dev->base_addr;