GTK create a queue of all the files in a directory recursively

list_dir.c

#include <gtk/gtk.h>

/*
 * Iterates a directory and all of its subdirectories to produce a list of the 
 * paths of the files inside of them.
 */
GQueue* list_directory(GString* dir_path) {
    GQueue* unchecked_queue;
    GQueue* checked_queue;
    
    unchecked_queue = g_queue_new();
    checked_queue = g_queue_new();
    g_queue_push_tail(unchecked_queue, dir_path);
    while (!g_queue_is_empty(unchecked_queue)) {
        GString* dequed_item_path;
        GFile* dequed_file;
        
        dequed_item_path = g_queue_pop_head(unchecked_queue);
        dequed_file = g_file_new_for_path(dequed_item_path->str);
        if (g_file_query_file_type(dequed_file, G_FILE_QUERY_INFO_NONE, NULL) == G_FILE_TYPE_DIRECTORY) {
            GFileEnumerator* enumerator;
            GFileInfo* enumerated_file_info;

            enumerator = g_file_enumerate_children(dequed_file, 
                G_FILE_ATTRIBUTE_STANDARD_NAME,
                G_FILE_QUERY_INFO_NONE,
                NULL, 
                NULL);
            enumerated_file_info = g_file_enumerator_next_file(enumerator,
                NULL,
                NULL); 
            while (enumerated_file_info != NULL) {
                GString* enumerated_file_path;

                enumerated_file_path = g_string_new(dequed_item_path->str);
                enumerated_file_path = g_string_append(enumerated_file_path, G_DIR_SEPARATOR_S);
                enumerated_file_path = g_string_append(enumerated_file_path, 
                    g_file_info_get_name(enumerated_file_info));
                g_queue_push_tail(unchecked_queue, enumerated_file_path);
                enumerated_file_info = g_file_enumerator_next_file(enumerator,
                    NULL,
                    NULL);
            }
            g_queue_push_tail(checked_queue, dequed_item_path);
        }
    }
    g_queue_free(unchecked_queue);

    return checked_queue;
}