diff --git a/sys/netgraph/ng_sample.c b/sys/netgraph/ng_sample.c
--- a/sys/netgraph/ng_sample.c
+++ b/sys/netgraph/ng_sample.c
@@ -271,7 +271,7 @@
 			struct ngxxxstat *stats;
 
 			NG_MKRESPONSE(resp, msg, sizeof(*stats), M_NOWAIT);
-			if (!resp) {
+			if (resp == NULL) {
 				error = ENOMEM;
 				break;
 			}
@@ -320,7 +320,7 @@
  * in the connect() method.
  */
 static int
-ng_xxx_rcvdata(hook_p hook, item_p item )
+ng_xxx_rcvdata(hook_p hook, item_p item)
 {
 	const xxx_p xxxp = NG_NODE_PRIVATE(NG_HOOK_NODE(hook));
 	int chan = -2;