remove an open coded NULL

diff --git a/cmd/tools/unflatten.c b/cmd/tools/unflatten.c
index 9296b57b4e5e0fbedb2bd1622c75e6446f8d970a..7b2a342c5161892ad339f43d40d94b9598776be7 100644 (file)
--- a/cmd/tools/unflatten.c
+++ b/cmd/tools/unflatten.c
@@ -219,7 +219,7 @@ static char **scanargs(int argc, char **argv)
 
 static Agraph_t *gread(FILE * fp)
 {
-    return agread(fp, (Agdisc_t *) 0);
+    return agread(fp, NULL);
 }
 
 int main(int argc, char **argv)