core: check that pointers received in arguments are not NULL in "free" functions

Functions:
- hdata_free
- infolist_var_free
- infolist_item_free
- infolist_free
- string_shared_free
- gui_window_objects_free
- gui_color_free
- gui_completion_free
- gui_filter_free
- gui_history_buffer_free
- gui_hotlist_free
- gui_key_free
- gui_lines_free
- gui_line_tags_free
- gui_line_free
- gui_window_tree_free
- gui_window_scroll_free

1 files changed, 3 insertions, 0 deletions

diff --git a/src/gui/gui-hotlist.c b/src/gui/gui-hotlist.c
index c7cc1700d..9bbcf65e0 100644
--- a/src/gui/gui-hotlist.c
+++ b/src/gui/gui-hotlist.c
@@ -96,6 +96,9 @@ gui_hotlist_free (struct t_gui_hotlist **hotlist,
 {
     struct t_gui_hotlist *new_hotlist;
 
+    if (!ptr_hotlist)
+        return;
+
     /* remove hotlist from queue */
     if (*last_hotlist == ptr_hotlist)
         *last_hotlist = ptr_hotlist->prev_hotlist;