Remove warning

ir/opt/local.c

@@ -24,10 +24,16 @@
 #include "irgopt.h"
 #include "opt_manage.h"
 
+static ir_graph_state_t do_optimize_graph_df(ir_graph *irg)
+{
+	optimize_graph_df(irg);
+	return 0;
+}
+
 static optdesc_t opt_local = {
 	"localopts",
 	0, // TODO optimize_graph_df handles preconditions itself
-	optimize_graph_df,
+	do_optimize_graph_df,
 };
 
 void local_opts(ir_graph *irg)