py: Allow to compile with extra warnings (sign-compare, unused-param).
diff --git a/py/objarray.c b/py/objarray.c
index 85b73ae..8c1caac 100644
--- a/py/objarray.c
+++ b/py/objarray.c
@@ -220,6 +220,8 @@
 }
 
 STATIC mp_obj_t memoryview_make_new(mp_obj_t type_in, mp_uint_t n_args, mp_uint_t n_kw, const mp_obj_t *args) {
+    (void)type_in;
+
     // TODO possibly allow memoryview constructor to take start/stop so that one
     // can do memoryview(b, 4, 8) instead of memoryview(b)[4:8] (uses less RAM)