Fix typo that I introduced in r357413. Thanks to ensadc@mailnesia.com for the catch.

git-svn-id: https://llvm.org/svn/llvm-project/libcxx/trunk@357474 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/src/chrono.cpp b/src/chrono.cpp
index 1758e6c..c1eb67b 100644
--- a/src/chrono.cpp
+++ b/src/chrono.cpp
@@ -195,7 +195,8 @@
 {
   static const LARGE_INTEGER freq = __QueryPerformanceFrequency();
 
-  LARGE_INTEGER counter = __QueryPerformanceFrequency();
+  LARGE_INTEGER counter;
+  (void) QueryPerformanceCounter(&counter);
   return time_point(duration(counter.QuadPart * nano::den / freq.QuadPart));
 }