Merge pull request #161 from google/oops

Fix build error (sz/size).
diff --git a/experimental/cache_size.cc b/experimental/cache_size.cc
index df108de..fe7cbfe 100644
--- a/experimental/cache_size.cc
+++ b/experimental/cache_size.cc
@@ -21,7 +21,7 @@
     // analyzes a range of memory sizes to find the maximum time needed to read
     // each of their elements
     for (int64_t size = kMinSize; size <= kMaxSize; size *= 1.5) {
-      fprintf(f, "%d, %lu\n", sz, FindMaxReadingTime(sz));
+      fprintf(f, "%d, %lu\n", size  , FindMaxReadingTime(size));
       std::cout << ".";
       std::flush(std::cout);
     }