Remove pointless casts from void pointers

Mostly in and around irq handlers.

Signed-off-by: Jeff Garzik <jgarzik@redhat.com>
Cc: Russell King <rmk@arm.linux.org.uk>
Cc: "Luck Tony" <tony.luck@intel.com>
Cc: Roman Zippel <zippel@linux-m68k.org>
Cc: Geert Uytterhoeven <geert@linux-m68k.org>
Cc: Paul Mackerras <paulus@samba.org>
Cc: Benjamin Herrenschmidt <benh@kernel.crashing.org>
Acked-by: Dmitry Torokhov <dtor@mail.ru>
Cc: Karsten Keil <kkeil@suse.de>
Acked-by: "John W. Linville" <linville@tuxdriver.com>
Cc: James Bottomley <James.Bottomley@steeleye.com>
Cc: David Brownell <david-b@pacbell.net>
Cc: "Antonino A. Daplas" <adaplas@pol.net>
Acked-by: Josh Boyer <jwboyer@linux.vnet.ibm.com>
Acked-by: Holger Schurig <hs4233@mail.mn-solutions.de>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
diff --git a/drivers/scsi/aic7xxx_old.c b/drivers/scsi/aic7xxx_old.c
index 3bfd929..93984c9 100644
--- a/drivers/scsi/aic7xxx_old.c
+++ b/drivers/scsi/aic7xxx_old.c
@@ -6472,7 +6472,7 @@
   unsigned long cpu_flags;
   struct aic7xxx_host *p;
   
-  p = (struct aic7xxx_host *)dev_id;
+  p = dev_id;
   if(!p)
     return IRQ_NONE;
   spin_lock_irqsave(p->host->host_lock, cpu_flags);