fix a stupid oversight from earlier

src/foreign/cache_esi_deliver.h

@@ -47,11 +47,9 @@ struct vped_gzgz_priv {
 	unsigned		magic;
 #define VPED_GZGZ_PRIV_MAGIC	0xaa9cd734
 	struct nexus_gzip	*gz;
-	ssize_t			start, last, stop, lpad;
+	uint64_t		start, last, stop, lpad;
 	ssize_t			ll;
-	// XXX was uint64_t - why a signed compare error in pesi
-	// but not in varnish-cache ?
-	int64_t		olen;
+	uint64_t		olen;
 	uint8_t			dbits[8];
 	uint8_t			tailbuf[8];
 };