remove unused variable

src/ngraph/runtime/gpu/gpu_external_function.cpp

@@ -246,7 +246,6 @@ ngraph::runtime::gpu::GPU_ExternalFunction::GPU_ExternalFunction(
     : ngraph::runtime::ExternalFunction(function, release_function)
     , m_compiled_function(nullptr)
     , m_emit_timing(std::getenv("NGRAPH_GPU_EMIT_TIMING") != nullptr)
-    , m_function_name(function->get_name())
 {
 }
 

src/ngraph/runtime/gpu/gpu_external_function.hpp

@@ -82,7 +82,6 @@ namespace ngraph
                 std::unique_ptr<codegen::ExecutionEngine> m_execution_engine;
                 bool m_emit_timing;
                 std::unordered_map<std::string, std::string> m_variable_name_map;
-                std::string m_function_name;
             };
         }
     }