1 files changed, 1 insertions, 1 deletions

diff --git a/drivers/isdn/capi/capilib.c b/drivers/isdn/capi/capilib.c
index 68409d971e73..34d8be2761c1 100644
--- a/drivers/isdn/capi/capilib.c
+++ b/drivers/isdn/capi/capilib.c
@@ -44,7 +44,7 @@ static inline void mq_init(struct capilib_ncci * np)
 static inline int mq_enqueue(struct capilib_ncci * np, u16 msgid)
 {
         struct capilib_msgidqueue *mq;
-        if ((mq = np->msgidfree) == 0)
+        if ((mq = np->msgidfree) == NULL)
                 return 0;
         np->msgidfree = mq->next;
         mq->msgid = msgid;