Address one last warning from MSVC.

Fixes #65.

Change-Id: Icd7381c4c98c676b15263f74b9e48f299f9d603c
Reviewed-on: https://code-review.googlesource.com/3842
Reviewed-by: Paul Wankadia <[email protected]>
diff --git a/util/benchmark.cc b/util/benchmark.cc
index c545034..b77e22d 100644
--- a/util/benchmark.cc
+++ b/util/benchmark.cc
@@ -126,7 +126,7 @@
 		if(ns/n == 0)
 			n = (int)1e9;
 		else
-			n = (int)1e9 / (ns/n);
+			n = (int)1e9 / static_cast<int>(ns/n);
 		
 		n = max(last+1, min(n+n/2, 100*last));
 		n = round(n);