meta: avoid warnings due to implicit conversions

src/entt/meta/meta.hpp

@@ -1475,7 +1475,7 @@ public:
 
     /*! @copydoc meta_data::operator== */
     [[nodiscard]] bool operator==(const meta_type &other) const noexcept {
-        return (ctx == other.ctx) && (!!node.info == !!other.node.info) && (node.info == nullptr || (*node.info == *other.node.info));
+        return (ctx == other.ctx) && ((node.info == nullptr) == (other.node.info == nullptr)) && (node.info == nullptr || (*node.info == *other.node.info));
     }
 
 private: