branches/zip: buf_page_peek_if_too_old(): Use 32-bit arithmetics

when comparing the age of access_time to buf_LRU_old_threshold_ms.
This fixes a bug on 64-bit systems.

ChangeLog

+2010-03-18	The InnoDB Team
+
+	* buf0buf.ic:
+	When comparing the time of the first access to a block against
+	innodb_old_blocks_time, use 32-bit arithmetics.  The comparison
+	was incorrect on 64-bit systems.
+
 2010-03-11	The InnoDB Team
 
 	* buf0buf.h, buf0buf.ic:

include/buf0buf.ic

@@ -81,7 +81,7 @@ buf_page_peek_if_too_old(
 		unsigned	access_time = buf_page_is_accessed(bpage);
 
 		if (access_time > 0
-		    && (ut_time_ms() - access_time)
+		    && ((ib_uint32_t) (ut_time_ms() - access_time))
 		    >= buf_LRU_old_threshold_ms) {
 			return(TRUE);
 		}