Remove read-only field p_callback_data

include/vlc_configuration.h

@@ -157,7 +157,6 @@ struct module_config_t
 
     /* Function to call when commiting a change */
     vlc_callback_t pf_callback;
-    void          *p_callback_data;
 
     /* Values list */
     char **      ppsz_list;       /* List of possible values for the option */

src/config/core.c

@@ -294,8 +294,7 @@ void config_PutPsz( vlc_object_t *p_this,
         vlc_value_t val;
 
         val.psz_string = (char *)psz_value;
-        p_config->pf_callback( p_this, psz_name, oldval, val,
-                               p_config->p_callback_data );
+        p_config->pf_callback( p_this, psz_name, oldval, val, NULL );
     }
 
     /* free old string */