Fix for an issue where varnishlog reports an incorrect "Length" entry on gunzipped delivery

bin/varnishd/cache/cache.h

@@ -823,7 +823,7 @@ void VGZ_UpdateObj(const struct vgz*, struct object *);
 int VGZ_WrwInit(struct vgz *vg);
 int VGZ_WrwGunzip(struct worker *w, struct vgz *, const void *ibuf,
     ssize_t ibufl);
-void VGZ_WrwFlush(const struct worker *wrk, struct vgz *vg);
+void VGZ_WrwFlush(struct worker *wrk, struct vgz *vg);
 
 /* Return values */
 #define VGZ_ERROR	-1

bin/varnishd/cache/cache_gzip.c

@@ -355,13 +355,15 @@ VGZ_WrwGunzip(struct worker *wrk, struct vgz *vg, const void *ibuf,
 /*--------------------------------------------------------------------*/
 
 void
-VGZ_WrwFlush(const struct worker *wrk, struct vgz *vg)
+VGZ_WrwFlush(struct worker *wrk, struct vgz *vg)
 {
 	CHECK_OBJ_NOTNULL(wrk, WORKER_MAGIC);
 	CHECK_OBJ_NOTNULL(vg, VGZ_MAGIC);
 
 	if (vg->m_len ==  0)
 		return;
+
+	wrk->acct_tmp.bodybytes += vg->m_len;
 	(void)WRW_Write(wrk, vg->m_buf, vg->m_len);
 	(void)WRW_Flush(wrk);
 	vg->m_len = 0;