From f7a3088da5a83565274b67f3d334a7b654502497 Mon Sep 17 00:00:00 2001
From: Thomas Schmucker <ts@its1.de>
Date: Fri, 4 Sep 2020 08:04:13 +0200
Subject: pop_front() entfernt ein Element aus der Liste, muss aber nicht immer
 dessen Daten zurückgeben!
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---
 list-tail-node.c | 5 ++++-
 1 file changed, 4 insertions(+), 1 deletion(-)

(limited to 'list-tail-node.c')

diff --git a/list-tail-node.c b/list-tail-node.c
index 52b93ce..c939b8d 100644
--- a/list-tail-node.c
+++ b/list-tail-node.c
@@ -75,7 +75,10 @@ list_pop_front(struct list *list, T *data)
 {
 	if ( list->head != NULL ) {
 		struct list_node *next = list->head->next;
-		*data                  = list->head->data;
+
+		if ( data != NULL ) {
+			*data = list->head->data;
+		}
 		free(list->head);
 		list->head = next;
 
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