🚨 fixed warnings

include/nlohmann/detail/iterators/iter_impl.hpp

@@ -607,7 +607,7 @@ class iter_impl
     /// associated JSON instance
     pointer m_object = nullptr;
     /// the actual iterator of the associated instance
-    internal_iterator<typename std::remove_const<BasicJsonType>::type> m_it;
+    internal_iterator<typename std::remove_const<BasicJsonType>::type> m_it {};
 };
 }  // namespace detail
-} // namespace nlohmann
+} // namespace nlohmann