[CPUFREQ] Read MSRs before trying to use them in powernow-k7

Very silly bug spotted by Ducrot Bruno

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

@@ -192,8 +192,8 @@ static void change_FID(int fid)
 {
 	union msr_fidvidctl fidvidctl;
 
-	if (fidvidctl.bits.FID != fid) {
 	rdmsrl (MSR_K7_FID_VID_CTL, fidvidctl.val);
+	if (fidvidctl.bits.FID != fid) {
 		fidvidctl.bits.SGTC = latency;
 		fidvidctl.bits.FID = fid;
 		fidvidctl.bits.FIDC = 1;
@@ -206,8 +206,8 @@ static void change_VID(int vid)
 {
 	union msr_fidvidctl fidvidctl;
 
-	if (fidvidctl.bits.VID != vid) {
 	rdmsrl (MSR_K7_FID_VID_CTL, fidvidctl.val);
+	if (fidvidctl.bits.VID != vid) {
 		fidvidctl.bits.VID = vid;
 		fidvidctl.bits.VIDC = 1;
 		wrmsrl (MSR_K7_FID_VID_CTL, fidvidctl.val);