Alistair Leslie-Hughes : wined3d: Allow passing NULL to context_reacquire( ).

[Alexandre Julliard]

Module: wine
Branch: master
Commit: c9ea06e7a8fef557bd781c2b56cd81a3629ec839
URL:    http://source.winehq.org/git/wine.git/?a=commit;h=c9ea06e7a8fef557bd781c2b56cd81a3629ec839

Author: Alistair Leslie-Hughes <leslie_alistair at hotmail.com>
Date:   Sat May 20 14:12:31 2017 +0200

wined3d: Allow passing NULL to context_reacquire().

A context associated with a query may be destroyed together
with a swapchain.

Signed-off-by: Józef Kucia <jkucia at codeweavers.com>
Signed-off-by: Henri Verbeet <hverbeet at codeweavers.com>
Signed-off-by: Alexandre Julliard <julliard at winehq.org>

---

 dlls/wined3d/context.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/dlls/wined3d/context.c b/dlls/wined3d/context.c
index 89731e5..6d09c22 100644
--- a/dlls/wined3d/context.c
+++ b/dlls/wined3d/context.c
@@ -3970,7 +3970,7 @@ struct wined3d_context *context_reacquire(const struct wined3d_device *device,
 {
     struct wined3d_context *current_context;
 
-    if (context->tid != GetCurrentThreadId())
+    if (!context || context->tid != GetCurrentThreadId())
         return NULL;
 
     current_context = context_acquire(device, context->current_rt.texture,