Warning fix for cvv module.

Author: asmorkalov

modules/cvv/test/test_reference.cpp

@@ -6,12 +6,12 @@ namespace opencv_test { namespace {
 
 /**
  * Makes sure that
- * - creating, reassigning and comparing `cvv::util::Reference<int>`s (from /src/util/util.hpp) works, 
+ * - creating, reassigning and comparing `cvv::util::Reference<int>`s (from /src/util/util.hpp) works,
  * 	as well as the
  * - `makeRef()` and `getPtr()` functions; that
  * - `Reference<const int>`s can be created with `makeRef(const int)`, `{const int}` initializer list
- * 	and via `Reference<const int>{int}` and, finally, that 
- * - `cvv::util::Reference`s of super classes can be constructed with derived classes and 
+ * 	and via `Reference<const int>{int}` and, finally, that
+ * - `cvv::util::Reference`s of super classes can be constructed with derived classes and
  * - `Reference`s to base classes can be `castTo()` `References` to the derived classes, but not the other way.
  */
 
@@ -71,7 +71,7 @@ TEST(ReferenceTest, ConstRefs)
 
 TEST(ReferenceTest, ConstRefsFromMutable)
 {
-	int i;
+	int i = 0;
 	Reference<const int> ref{ i };
 	EXPECT_EQ(ref.getPtr(), &i);
 }