common: squash -Wswitch-default warning in 'cvtPt'

This switch is exhaustive, as `rankdir` is only intended to be one of the four
covered rank direction constants.

diff --git a/lib/common/shapes.c b/lib/common/shapes.c
index 1bdc9ac73729b0b3c9803a6e8ea8d31e10c35da8..32bdd4c2a719a5ff1146e8153fb53e9b67eca82a 100644 (file)
--- a/lib/common/shapes.c
+++ b/lib/common/shapes.c
@@ -4087,6 +4087,8 @@ static point cvtPt(pointf p, int rankdir)
        q.y = p.x;
        q.x = p.y;
        break;
+    default:
+       UNREACHABLE();
     }
     PF2P(q, Q);
     return Q;