Remove a redundant declaration.

src/ngraph/runtime/cpu/builder/concat.cpp

@@ -32,7 +32,6 @@ namespace ngraph
             template <>
             void Builder::BUILDER_DECL(ngraph::op::Concat)
             {
-
                 auto concat = static_cast<const ngraph::op::Concat*>(node);
                 auto axis = concat->get_concatenation_axis();
 
@@ -98,7 +97,6 @@ namespace ngraph
 
                     size_t concat_dim =
                         (dynamic_cast<const ngraph::op::Concat*>(node))->get_concatenation_axis();
-                    auto nargs = args.size();
                     auto concat_index =
                         mkldnn_emitter->build_concat(inputs_data_desc, result_desc, concat_dim);
                     auto& deps = mkldnn_emitter->get_primitive_deps(concat_index);

test/backend_test.in.cpp

@@ -704,7 +704,6 @@ NGRAPH_TEST(${BACKEND_NAME}, concat_in_place_propagate_2d_tensor)
     EXPECT_EQ((vector<float>{3, 7, 2}), read_vector<float>(result));
 }
 
-
 // from numpy import *
 // a=linspace(1,2*3*4*3*2,2*3*4*3*2)
 // b=linspace(1000+1,1000+2*3*3*3*2,2*3*3*3*2)