topfish ddist: rephrase an open coded 'hypot'

diff --git a/lib/topfish/hierarchy.c b/lib/topfish/hierarchy.c
index 771ffb34dc5af24cd69c99771900af5c1f2b0ba5..40a119f8da76340e25be143ab497534472a1860e 100644 (file)
--- a/lib/topfish/hierarchy.c
+++ b/lib/topfish/hierarchy.c
@@ -127,7 +127,7 @@ static double ddist(ex_vtx_data * geom_graph, int v, int u)
     double x_v = geom_graph[v].x_coord, y_v = geom_graph[v].y_coord,
        x_u = geom_graph[u].x_coord, y_u = geom_graph[u].y_coord;
 
-    return sqrt((x_v - x_u) * (x_v - x_u) + (y_v - y_u) * (y_v - y_u));
+    return hypot(x_v - x_u, y_v - y_u);
 }
 
 extern void quicksort_place(double *, int *, int first, int last);