Fix compilation warnings

Author: Hai Zaar <haizaar@haizaar.com>

--- snooze.c.orig	2009-04-01 12:23:04.000000000 +0300
+++ snooze.c	2009-04-01 12:24:39.000000000 +0300
@@ -39,7 +39,7 @@
  * sleep time, if other pwauth processes are in sleeps.
  */
 
-snooze(int seconds)
+void snooze(int seconds)
 {
 #ifdef SLEEP_LOCK
     int slfd;