[master] ace9bce Don't rely on busyobj for cheap optimization

[Poul-Henning Kamp]

commit ace9bce68363f3fc2759e37268ded2b30c71ae34
Author: Poul-Henning Kamp <phk at FreeBSD.org>
Date:   Tue Jul 15 09:24:47 2014 +0000

    Don't rely on busyobj for cheap optimization

diff --git a/bin/varnishd/cache/cache_gzip.c b/bin/varnishd/cache/cache_gzip.c
index 5abefbb..904d26d 100644
--- a/bin/varnishd/cache/cache_gzip.c
+++ b/bin/varnishd/cache/cache_gzip.c
@@ -456,10 +456,9 @@ vfp_gzip_init(struct vfp_ctx *vc, struct vfp_entry *vfe)
 	struct vgz *vg;
 
         CHECK_OBJ_NOTNULL(vc, VFP_CTX_MAGIC);
-        CHECK_OBJ_NOTNULL(vc->bo, BUSYOBJ_MAGIC);
 	CHECK_OBJ_NOTNULL(vfe, VFP_ENTRY_MAGIC);
 
-	if (vc->bo->content_length == 0) {
+	if (http_HdrIs(vc->http, H_Content_Length, "0")) {
 		http_Unset(vc->http, H_Content_Encoding);
 		return (VFP_NULL);
 	}