Fix warning

source/RobotAPI/libraries/armem/server/wm/memory_definitions.cpp

@@ -37,7 +37,7 @@ namespace armarx::armem::server::wm
                 removedElements.push_back(std::move(this->_container.begin()->second));
                 this->_container.erase(this->_container.begin());
             }
-            ARMARX_CHECK_LESS_EQUAL(this->_container.size(), _maxHistorySize);
+            ARMARX_CHECK_LESS_EQUAL(this->_container.size(), size_t(_maxHistorySize));
         }
         return removedElements;
     }