wined3d: Properly destroy contexts not owned by the implcit swapchain.

dlls/wined3d/device.c

@@ -5547,11 +5547,11 @@ static void delete_opengl_contexts(struct wined3d_device *device, struct wined3d
 
     while (device->context_count)
     {
-        context_destroy(device, device->contexts[0]);
+        swapchain_destroy_contexts(device->contexts[0]->swapchain);
     }
+
     HeapFree(GetProcessHeap(), 0, swapchain->context);
     swapchain->context = NULL;
-    swapchain->num_contexts = 0;
 }
 
 /* Do not call while under the GL lock. */

dlls/wined3d/swapchain.c

@@ -1164,6 +1164,17 @@ static struct wined3d_context *swapchain_create_context(struct wined3d_swapchain
     return ctx;
 }
 
+void swapchain_destroy_contexts(struct wined3d_swapchain *swapchain)
+{
+    unsigned int i;
+
+    for (i = 0; i < swapchain->num_contexts; ++i)
+    {
+        context_destroy(swapchain->device, swapchain->context[i]);
+    }
+    swapchain->num_contexts = 0;
+}
+
 struct wined3d_context *swapchain_get_context(struct wined3d_swapchain *swapchain)
 {
     DWORD tid = GetCurrentThreadId();

dlls/wined3d/wined3d_private.h

@@ -2493,6 +2493,7 @@ struct wined3d_swapchain
 void x11_copy_to_screen(struct wined3d_swapchain *swapchain, const RECT *rect) DECLSPEC_HIDDEN;
 
 struct wined3d_context *swapchain_get_context(struct wined3d_swapchain *swapchain) DECLSPEC_HIDDEN;
+void swapchain_destroy_contexts(struct wined3d_swapchain *swapchain) DECLSPEC_HIDDEN;
 
 #define DEFAULT_REFRESH_RATE 0