Fix Wsign-compare warning

controller_interface/include/semantic_components/semantic_component_interface.hpp

@@ -91,7 +91,7 @@ class SemanticComponentInterface
       return false;
     }
     // insert all the values
-    for (auto i = 0; i < state_interfaces_.size(); ++i)
+    for (auto i = 0u; i < state_interfaces_.size(); ++i)
     {
       values.emplace_back(state_interfaces_[i].get().get_value());
     }