Make Synchronized tests work with gtest-1.7

Summary: Gtest-1.7's ASSERT macros don't work with types with explicit conversions to bool, so do the cast for it.

Reviewed By: yfeldblum

Differential Revision: D3570782

fbshipit-source-id: 885a1022675e63afca00219c5b9de3791742207f

folly/test/SynchronizedTestLib-inl.h

@@ -598,7 +598,7 @@ void testTimed() {
   // Make sure we can lock with various timeout duration units
   {
     auto lv = v.contextualLock(std::chrono::milliseconds(5));
-    EXPECT_TRUE(lv);
+    EXPECT_TRUE(bool(lv));
     EXPECT_FALSE(lv.isNull());
     auto lv2 = v.contextualLock(std::chrono::microseconds(5));
     // We may or may not acquire lv2 successfully, depending on whether
@@ -606,7 +606,7 @@ void testTimed() {
   }
   {
     auto lv = v.contextualLock(std::chrono::seconds(1));
-    EXPECT_TRUE(lv);
+    EXPECT_TRUE(bool(lv));
   }
 }