Fix warning

tools/starpu_perfmodel_display.c

@@ -158,7 +158,7 @@ int main(int argc, char **argv)
 	}
 	else
 	{
-		struct starpu_perfmodel model = {};
+		struct starpu_perfmodel model = { .type = STARPU_PERFMODEL_INVALID };
                 int ret = starpu_perfmodel_load_symbol(psymbol, &model);
                 if (ret == 1)
 		{

tools/starpu_perfmodel_plot.c

@@ -427,7 +427,7 @@ static void display_selected_models(FILE *gnuplot_file, struct starpu_perfmodel
 int main(int argc, char **argv)
 {
 	int ret = 0;
-	struct starpu_perfmodel model = {};
+	struct starpu_perfmodel model = { .type = STARPU_PERFMODEL_INVALID };
 	char gnuplot_file_name[256];
 	struct _perfmodel_plot_options options;