all: Remove 'name' member from mp_obj_module_t struct.

One can instead lookup __name__ in the modules dict to get the value.
diff --git a/py/objmodule.c b/py/objmodule.c
index dc2ce78..9b06e3b 100644
--- a/py/objmodule.c
+++ b/py/objmodule.c
@@ -37,17 +37,23 @@
     (void)kind;
     mp_obj_module_t *self = MP_OBJ_TO_PTR(self_in);
 
+    const char *module_name = "";
+    mp_map_elem_t *elem = mp_map_lookup(&self->globals->map, MP_OBJ_NEW_QSTR(MP_QSTR___name__), MP_MAP_LOOKUP);
+    if (elem != NULL) {
+        module_name = mp_obj_str_get_str(elem->value);
+    }
+
 #if MICROPY_PY___FILE__
     // If we store __file__ to imported modules then try to lookup this
     // symbol to give more information about the module.
-    mp_map_elem_t *elem = mp_map_lookup(&self->globals->map, MP_OBJ_NEW_QSTR(MP_QSTR___file__), MP_MAP_LOOKUP);
+    elem = mp_map_lookup(&self->globals->map, MP_OBJ_NEW_QSTR(MP_QSTR___file__), MP_MAP_LOOKUP);
     if (elem != NULL) {
-        mp_printf(print, "<module '%q' from '%s'>", self->name, mp_obj_str_get_str(elem->value));
+        mp_printf(print, "<module '%s' from '%s'>", module_name, mp_obj_str_get_str(elem->value));
         return;
     }
 #endif
 
-    mp_printf(print, "<module '%q'>", self->name);
+    mp_printf(print, "<module '%s'>", module_name);
 }
 
 STATIC void module_attr(mp_obj_t self_in, qstr attr, mp_obj_t *dest) {
@@ -106,7 +112,6 @@
     // create new module object
     mp_obj_module_t *o = m_new_obj(mp_obj_module_t);
     o->base.type = &mp_type_module;
-    o->name = module_name;
     o->globals = MP_OBJ_TO_PTR(mp_obj_new_dict(MICROPY_MODULE_DICT_SIZE));
 
     // store __name__ entry in the module