resolve cppcheck warnings

src/targets/gpu/include/migraphx/gpu/int8_conv_pack.hpp

@@ -16,7 +16,7 @@ struct miopen_int8_conv_pack
     std::string name() const { return "gpu::int8_conv_pack"; }
     shape compute_shape(const std::vector<shape>& inputs) const;
     argument
-    compute(context& ctx, const shape& output_shape, const std::vector<argument>& args) const;
+    compute(context& ctx, const shape&, const std::vector<argument>& args) const;
     std::ptrdiff_t output_alias(const std::vector<shape>& shapes) const
     {
         return shapes.size() - 1;

src/targets/gpu/int8_conv_pack.cpp

@@ -12,7 +12,7 @@ shape miopen_int8_conv_pack::compute_shape(const std::vector<shape>& inputs) con
 }
 
 argument miopen_int8_conv_pack::compute(context& ctx,
-                                        const shape& output_shape,
+                                        const shape&,
                                         const std::vector<argument>& args) const
 {
     auto arg_desc      = make_tensor(args[0].get_shape());