Fix typo.

src/include/storage/s_lock.h

@@ -66,7 +66,7 @@
  * Portions Copyright (c) 1996-2005, PostgreSQL Global Development Group
  * Portions Copyright (c) 1994, Regents of the University of California
  *
- *	  $PostgreSQL: pgsql/src/include/storage/s_lock.h,v 1.144 2005/12/17 20:39:16 momjian Exp $
+ *	  $PostgreSQL: pgsql/src/include/storage/s_lock.h,v 1.145 2005/12/17 21:08:24 momjian Exp $
  *
  *-------------------------------------------------------------------------
  */
@@ -728,7 +728,7 @@ typedef unsigned long slock_t;
 #endif	 /* __sgi */
 
 
-#if defined(sinix)		/* Sinux */
+#if defined(sinix)		/* Sinix */
 /*
  * SINIX / Reliant UNIX
  * slock_t is defined as a struct abilock_t, which has a single unsigned long