x86: pvclock: fix shadowed variable warning

arch/x86/kernel/pvclock.c:102:6: warning: symbol 'tsc_khz' shadows an earlier one
include/asm/tsc.h:18:21: originally declared here
Signed-off-by: Harvey Harrison <harvey.harrison@gmail.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Avi Kivity <avi@redhat.com>

arch/x86/kernel/pvclock.c

@@ -99,14 +99,14 @@ static unsigned pvclock_get_time_values(struct pvclock_shadow_time *dst,
 
 unsigned long pvclock_tsc_khz(struct pvclock_vcpu_time_info *src)
 {
-	u64 tsc_khz = 1000000ULL << 32;
+	u64 pv_tsc_khz = 1000000ULL << 32;
 
-	do_div(tsc_khz, src->tsc_to_system_mul);
+	do_div(pv_tsc_khz, src->tsc_to_system_mul);
 	if (src->tsc_shift < 0)
-		tsc_khz <<= -src->tsc_shift;
+		pv_tsc_khz <<= -src->tsc_shift;
 	else
-		tsc_khz >>= src->tsc_shift;
-	return tsc_khz;
+		pv_tsc_khz >>= src->tsc_shift;
+	return pv_tsc_khz;
 }
 
 cycle_t pvclock_clocksource_read(struct pvclock_vcpu_time_info *src)