timer: make timers_state static

Signed-off-by: Liu Ping Fan <pingfank@linux.vnet.ibm.com>
Reviewed-by: Jan Kiszka <jan.kiszka@siemens.com>
Signed-off-by: Michael Tokarev <mjt@tls.msk.ru>
diff --git a/cpus.c b/cpus.c
index ca6b886..0f65e76 100644
--- a/cpus.c
+++ b/cpus.c
@@ -112,7 +112,7 @@
     int64_t dummy;
 } TimersState;
 
-TimersState timers_state;
+static TimersState timers_state;
 
 /* Return the virtual CPU time, based on the instruction counter.  */
 int64_t cpu_get_icount(void)