drm/nvc0/graph: remove redundant null checks

It's safe to call kfree(NULL).

Found by smatch.
Signed-off-by: Marcin Slusarz <marcin.slusarz@gmail.com>
Signed-off-by: Ben Skeggs <bskeggs@redhat.com>

drivers/gpu/drm/nouveau/core/engine/graph/nvc0.c

@@ -613,10 +613,8 @@ nvc0_graph_ctor(struct nouveau_object *parent, struct nouveau_object *engine,
 static void
 nvc0_graph_dtor_fw(struct nvc0_graph_fuc *fuc)
 {
-	if (fuc->data) {
 	kfree(fuc->data);
 	fuc->data = NULL;
-	}
 }
 
 void
@@ -624,7 +622,6 @@ nvc0_graph_dtor(struct nouveau_object *object)
 {
 	struct nvc0_graph_priv *priv = (void *)object;
 
-	if (priv->data)
 	kfree(priv->data);
 
 	nvc0_graph_dtor_fw(&priv->fuc409c);