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Add freeing of owned strings in qmenu items

--- a/term_util.c

+++ b/term_util.c

@@ -449,8 +449,16 @@

 void qmenu_free(Qmenu* qm) {

   unpost_menu(qm->ncurses_menu);

   free_menu(qm->ncurses_menu);

+  struct Qmenu_item_extra* extras = qmenu_item_extras_ptr(qm);

   for (Usz i = 0; i < qm->items_count; ++i) {

+    ITEM* item = qm->ncurses_items[i];

+    struct Qmenu_item_extra* extra = qmenu_itemextra(extras, item);

+    char const* freed_str = NULL;

+    if (extra->owns_string)

+      freed_str = item_name(item);

     free_item(qm->ncurses_items[i]);

+    if (freed_str)

+      free((void*)freed_str);

   }

   free(qm->ncurses_items);

   free(qm);