Juan Lang : crypt32: Don't crash on freeing null chain engine.

[Alexandre Julliard]

Module: wine
Branch: master
Commit: 0624ba1b2e81795df579a0377eb993729836d289
URL:    http://source.winehq.org/git/?p=wine.git;a=commit;h=0624ba1b2e81795df579a0377eb993729836d289

Author: Juan Lang <juan_lang at yahoo.com>
Date:   Wed Sep 20 11:49:48 2006 -0700

crypt32: Don't crash on freeing null chain engine.

---

 dlls/crypt32/chain.c |    2 +-
 1 files changed, 1 insertions(+), 1 deletions(-)

diff --git a/dlls/crypt32/chain.c b/dlls/crypt32/chain.c
index 9e2db16..147535d 100644
--- a/dlls/crypt32/chain.c
+++ b/dlls/crypt32/chain.c
@@ -163,7 +163,7 @@ void WINAPI CertFreeCertificateChainEngi
 
     TRACE("(%p)\n", hChainEngine);
 
-    if (InterlockedDecrement(&engine->ref) == 0)
+    if (engine && InterlockedDecrement(&engine->ref) == 0)
     {
         CertCloseStore(engine->hWorld, 0);
         CertCloseStore(engine->hRoot, 0);