[CPUFREQ] Fix FSB calculation in powernow-k7

use the maximum fid instead of the current fid.

From: Bruno Ducrot
Signed-off-by: Dave Jones <davej@redhat.com>

arch/i386/kernel/cpu/cpufreq/powernow-k7.c

@@ -565,7 +565,7 @@ static int __init powernow_cpu_init (struct cpufreq_policy *policy)
 	rdmsrl (MSR_K7_FID_VID_STATUS, fidvidstatus.val);
 
 	/* A K7 with powernow technology is set to max frequency by BIOS */
-	fsb = (10 * cpu_khz) / fid_codes[fidvidstatus.bits.CFID];
+	fsb = (10 * cpu_khz) / fid_codes[fidvidstatus.bits.MFID];
 	if (!fsb) {
 		printk(KERN_WARNING PFX "can not determine bus frequency\n");
 		return -EINVAL;