Alexandre Julliard : winex11: Don't delete the DC if it' s not for a valid pbuffer.

[Alexandre Julliard]

Module: wine
Branch: master
Commit: 64aed7c5be455db9315a39e33fdc84dd3a284255
URL:    http://source.winehq.org/git/wine.git/?a=commit;h=64aed7c5be455db9315a39e33fdc84dd3a284255

Author: Alexandre Julliard <julliard at winehq.org>
Date:   Wed Oct 17 21:40:52 2012 +0200

winex11: Don't delete the DC if it's not for a valid pbuffer.

---

 dlls/winex11.drv/opengl.c |    5 ++++-
 1 files changed, 4 insertions(+), 1 deletions(-)

diff --git a/dlls/winex11.drv/opengl.c b/dlls/winex11.drv/opengl.c
index 5151e20..cf99876 100644
--- a/dlls/winex11.drv/opengl.c
+++ b/dlls/winex11.drv/opengl.c
@@ -2318,14 +2318,17 @@ static int X11DRV_wglReleasePbufferDCARB( struct wgl_pbuffer *object, HDC hdc )
     TRACE("(%p, %p)\n", object, hdc);
 
     EnterCriticalSection( &context_section );
+
     if (!XFindContext( gdi_display, (XID)hdc, gl_pbuffer_context, (char **)&gl ))
     {
         XDeleteContext( gdi_display, (XID)hdc, gl_pbuffer_context );
         free_gl_drawable( gl );
     }
+    else hdc = 0;
+
     LeaveCriticalSection( &context_section );
 
-    return DeleteDC(hdc);
+    return hdc && DeleteDC(hdc);
 }
 
 /**