[ATM]: No need to return void

The module_exit function has return-type void and pci_unregister_driver()
returns void anyway.

Signed-off-by: Tobias Klauser <tklauser@distanz.ch>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: David S. Miller <davem@davemloft.net>

drivers/atm/ambassador.c

diff --git a/drivers/atm/ambassador.c b/drivers/atm/ambassador.c
index 323592d..9fffa7af 100644
--- a/drivers/atm/ambassador.c
+++ b/drivers/atm/ambassador.c
@@ -2452,8 +2452,8 @@
 static void __exit amb_module_exit (void)
 {
   PRINTD (DBG_FLOW|DBG_INIT, "cleanup_module");
-  
-  return pci_unregister_driver(&amb_driver);
+
+  pci_unregister_driver(&amb_driver);
 }
 
 module_init(amb_module_init);