dotgen dot_position: squash -Wunused-variable warning in release mode

diff --git a/lib/dotgen/position.c b/lib/dotgen/position.c
index 9637ac725c24335862e3e935ff88e743fc705e49..a1c7758f71ddea42a2c4ac0beae31b5235a8fe0d 100644 (file)
--- a/lib/dotgen/position.c
+++ b/lib/dotgen/position.c
@@ -131,6 +131,7 @@ void dot_position(graph_t * g, aspect_t* asp)
        connectGraph (g);
        const int rank_result = rank(g, 2, nsiter2(g));
        assert(rank_result == 0);
+       (void)rank_result;
     }
     set_xcoords(g);
     set_aspect(g, asp);