zone.lisp: Mark an ignored function parameter.

CLisp complains about this one, but SBCL doesn't mind.

diff --git a/zone.lisp b/zone.lisp
index 38c79f0..8124b28 100644 (file)
--- a/zone.lisp
+++ b/zone.lisp
@@ -786,6 +786,7 @@
   "Stream to write zone data on.")
 
 (defmethod zone-write :around (format zone stream)
+  (declare (ignore format))
   (let ((*writing-zone* zone)
        (*zone-output-stream* stream))
     (call-next-method)))