[CPUFREQ] Make cpu_shared_core_mask static.

Spotted-by: Dominik Brodowski <linux@dominikbrodowski.net>
Signed-off-by: Dave Jones <davej@redhat.com>

--- kernel/arch/i386/kernel/cpu/cpufreq/powernow-k8.c~	2005-05-10 22:45:38.000000000 -0400
+++ kernel/arch/i386/kernel/cpu/cpufreq/powernow-k8.c	2005-05-10 22:45:56.000000000 -0400
@@ -47,7 +47,7 @@
 #define VERSION "version 1.40.0"
 #include "powernow-k8.h"
 
-cpumask_t cpu_sharedcore_mask[NR_CPUS];
+static cpumask_t cpu_sharedcore_mask[NR_CPUS];
 
 /* serialize freq changes  */
 static DECLARE_MUTEX(fidvid_sem);