py: Eliminate some cases which trigger unused parameter warnings.
diff --git a/py/objarray.c b/py/objarray.c
index f5ea794..3f432f0 100644
--- a/py/objarray.c
+++ b/py/objarray.c
@@ -488,6 +488,8 @@
         }
         bufinfo->buf = (uint8_t*)bufinfo->buf + (mp_uint_t)o->free * sz;
     }
+    #else
+    (void)flags;
     #endif
     return 0;
 }