[master] d6b13ddef Null check

[Dridi Boukelmoune]

commit d6b13ddef9557e3269f2cc4c014d47487447ef31
Author: Dridi Boukelmoune <dridi.boukelmoune at gmail.com>
Date:   Wed Feb 6 18:23:36 2019 +0100

    Null check

diff --git a/bin/varnishd/cache/cache_range.c b/bin/varnishd/cache/cache_range.c
index c59fe857f..156e50e6f 100644
--- a/bin/varnishd/cache/cache_range.c
+++ b/bin/varnishd/cache/cache_range.c
@@ -67,6 +67,7 @@ vrg_range_bytes(struct req *req, enum vdp_action act, void **priv,
 	struct vrg_priv *vrg_priv;
 
 	CHECK_OBJ_NOTNULL(req, REQ_MAGIC);
+	AN(priv);
 	CAST_OBJ_NOTNULL(vrg_priv, *priv, VRG_PRIV_MAGIC);
 
 	l = vrg_priv->range_low - vrg_priv->range_off;