[ATM]: No need to return void

The module_exit function has return-type void and pci_unregister_driver()
returns void anyway.
Signed-off-by: NTobias Klauser <tklauser@distanz.ch>
Signed-off-by: NAndrew Morton <akpm@osdl.org>
Signed-off-by: NDavid S. Miller <davem@davemloft.net>

drivers/atm/ambassador.c

@@ -2452,8 +2452,8 @@ static int __init amb_module_init (void)
 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);

drivers/atm/horizon.c

@@ -2932,8 +2932,8 @@ static int __init hrz_module_init (void) {
 
 static void __exit hrz_module_exit (void) {
   PRINTD (DBG_FLOW, "cleanup_module");
-  
-  return pci_unregister_driver(&hrz_driver);
+
+  pci_unregister_driver(&hrz_driver);
 }
 
 module_init(hrz_module_init);