fixup! refscale: Add measurement of clock readout

Signed-off-by: Paul E. McKenney <paulmck@kernel.org>
diff --git a/kernel/rcu/refscale.c b/kernel/rcu/refscale.c
index 20e892b..9eb8672 100644
--- a/kernel/rcu/refscale.c
+++ b/kernel/rcu/refscale.c
@@ -471,7 +471,7 @@ static volatile u64 stopopts;
 
 static void ref_clock_section(const int nloops)
 {
-	u64 x;
+	u64 x = 0;
 	int i;
 
 	preempt_disable();
@@ -484,7 +484,7 @@ static void ref_clock_section(const int nloops)
 
 static void ref_clock_delay_section(const int nloops, const int udl, const int ndl)
 {
-	u64 x;
+	u64 x = 0;
 	int i;
 
 	preempt_disable();