[CCID]: Make ccid_hc_[rt]x_exit accept NULL arguments

Just like kfree, etc it will just not call the CCID exit
routines when the private data area is set to NULL.

Signed-off-by: Arnaldo Carvalho de Melo <acme@mandriva.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

1 files changed, 4 insertions, 2 deletions

diff --git a/net/dccp/ccid.h b/net/dccp/ccid.h
index 95eb47d85517..c6767b282244 100644
--- a/net/dccp/ccid.h
+++ b/net/dccp/ccid.h
@@ -97,13 +97,15 @@ static inline int ccid_hc_tx_init(struct ccid *ccid, struct sock *sk)
 
 static inline void ccid_hc_rx_exit(struct ccid *ccid, struct sock *sk)
 {
-        if (ccid->ccid_hc_rx_exit != NULL)
+        if (ccid->ccid_hc_rx_exit != NULL &&
+            dccp_sk(sk)->dccps_hc_rx_ccid_private != NULL)
                 ccid->ccid_hc_rx_exit(sk);
 }
 
 static inline void ccid_hc_tx_exit(struct ccid *ccid, struct sock *sk)
 {
-        if (ccid->ccid_hc_tx_exit != NULL)
+        if (ccid->ccid_hc_tx_exit != NULL &&
+            dccp_sk(sk)->dccps_hc_tx_ccid_private != NULL)
                 ccid->ccid_hc_tx_exit(sk);
 }