remove an unnecessary open coded NULL

diff --git a/cmd/tools/nop.c b/cmd/tools/nop.c
index a36fd7a97dfae937f2f4f22d29329aab0ec379e1..0fc805c0ecf3ad66db7c4b57a7b5d8320743b275 100644 (file)
--- a/cmd/tools/nop.c
+++ b/cmd/tools/nop.c
@@ -67,7 +67,7 @@ static void init(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)