Dmitry Timoshkov : dwrite: Avoid triggering an exception on DLL_PROCESS_DETACH.

[Alexandre Julliard]

Module: wine
Branch: master
Commit: 1ea524a861f94e09a609507d6b6d0079ff87dae2
URL:    http://source.winehq.org/git/wine.git/?a=commit;h=1ea524a861f94e09a609507d6b6d0079ff87dae2

Author: Dmitry Timoshkov <dmitry at baikal.ru>
Date:   Mon Jan 28 14:37:36 2013 +0800

dwrite: Avoid triggering an exception on DLL_PROCESS_DETACH.

---

 dlls/dwrite/font.c |    3 ++-
 1 files changed, 2 insertions(+), 1 deletions(-)

diff --git a/dlls/dwrite/font.c b/dlls/dwrite/font.c
index 0ec581b..191397e 100644
--- a/dlls/dwrite/font.c
+++ b/dlls/dwrite/font.c
@@ -793,7 +793,8 @@ static void release_font_collection(IDWriteFontCollection *iface)
 
 void release_system_fontcollection(void)
 {
-    release_font_collection(system_collection);
+    if (system_collection)
+        release_font_collection(system_collection);
 }
 
 HRESULT get_system_fontcollection(IDWriteFontCollection **collection)