m_option: remove an unused field

options/m_option.c

@@ -3019,15 +3019,6 @@ static int parse_obj_settings(struct mp_log *log, struct bstr opt, int op,
         skip = true;
     }
 
-    if (_ret && desc.init_options) {
-        struct m_config *config = m_config_from_obj_desc_noalloc(NULL, log, &desc);
-        bstr s = bstr0(desc.init_options);
-        m_obj_parse_sub_config(log, opt, str, &s, config,
-                               M_SETOPT_CHECK_ONLY, nopos, NULL, list, &plist);
-        assert(s.len == 0);
-        talloc_free(config);
-    }
-
     if (has_param) {
         struct m_config *config = NULL;
         if (!skip)

options/m_option.h

@@ -123,10 +123,6 @@ struct m_obj_desc {
     const char *options_prefix;
     // For free use by the implementer of m_obj_list.get_desc
     const void *p;
-    // If not NULL, options which should be set before applying other options.
-    // This member is usually set by m_obj_list_find() only, and read by the
-    // option parser. It's not used anywhere else.
-    const char *init_options;
     // Don't list entry with "help"
     bool hidden;
     // Callback to print custom help if "vf=entry=help" is passed