nouveau: fix potential crash

diff --git a/src/gallium/winsys/dri/nouveau/nouveau_context.c b/src/gallium/winsys/dri/nouveau/nouveau_context.c
index dc852c9..2e54729 100644 (file)
--- a/src/gallium/winsys/dri/nouveau/nouveau_context.c
+++ b/src/gallium/winsys/dri/nouveau/nouveau_context.c
@@ -256,8 +256,10 @@ nouveau_context_destroy(__DRIcontextPrivate *driContextPriv)
 
        if (nv->pctx_id >= 0) {
                nvc->pctx[nv->pctx_id] = NULL;
-               if (--nvc->refcount <= 0)
+               if (--nvc->refcount <= 0) {
                        nouveau_channel_context_destroy(nvc);
+                       nv->nv_screen->nvc = NULL;
+               }
        }
 
        free(nv);