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, 2 insertions, 7 deletions

diff --git a/drivers/net/irda/nsc-ircc.c b/drivers/net/irda/nsc-ircc.c
index ea12e999814a..29b5ccd29d0b 100644
--- a/drivers/net/irda/nsc-ircc.c
+++ b/drivers/net/irda/nsc-ircc.c
@@ -2068,17 +2068,12 @@ static void nsc_ircc_fir_interrupt(struct nsc_ircc_cb *self, int iobase,
  */
 static irqreturn_t nsc_ircc_interrupt(int irq, void *dev_id)
 {
-        struct net_device *dev = (struct net_device *) dev_id;
+        struct net_device *dev = dev_id;
         struct nsc_ircc_cb *self;
         __u8 bsr, eir;
         int iobase;
 
-        if (!dev) {
-                IRDA_WARNING("%s: irq %d for unknown device.\n",
-                             driver_name, irq);
-                return IRQ_NONE;
-        }
-        self = (struct nsc_ircc_cb *) dev->priv;
+        self = dev->priv;
 
         spin_lock(&self->lock);