py: Replace stream_p with *stream_p in mp_obj_type_t.

This is to reduce ROM usage.  stream_p is used in file and socket types
only (at the moment), so seems a good idea to make the protocol
functions a pointer instead of the actual structure.

It saves 308 bytes of ROM in the stmhal/ port, 928 in unix/.

1 files changed, 1 insertions, 1 deletions

diff --git a/py/obj.h b/py/obj.h
index e800addade..fc99055b6e 100644
--- a/py/obj.h
+++ b/py/obj.h
@@ -229,7 +229,7 @@ struct _mp_obj_type_t {
     // in mp_obj_type_t at the expense of extra pointer and extra dereference
     // when actually used.
     mp_buffer_p_t buffer_p;
-    mp_stream_p_t stream_p;
+    const mp_stream_p_t *stream_p;
 
     // these are for dynamically created types (classes)
     mp_obj_t bases_tuple;