Fix the following warning.

  drivers/gpu/drm/nouveau/nouveau_fence.c:210:45: sparse: sparse:
  incorrect type in initializer (different address spaces)
  @@     expected struct nouveau_channel *chan
  @@     got struct nouveau_channel [noderef] __rcu *channel

We're just about to emit the fence, there is nothing to protect against
yet, hence it is safe to just cast __rcu away.

Reported-by: kernel test robot <l...@intel.com>
Closes: 
https://lore.kernel.org/oe-kbuild-all/202309140340.bwkxzadx-...@intel.com/
Fixes: 978474dc8278 ("drm/nouveau: fence: fix undefined fence state after emit")
Signed-off-by: Danilo Krummrich <d...@redhat.com>
---
 drivers/gpu/drm/nouveau/nouveau_fence.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/gpu/drm/nouveau/nouveau_fence.c 
b/drivers/gpu/drm/nouveau/nouveau_fence.c
index 61d9e70da9fd..ca762ea55413 100644
--- a/drivers/gpu/drm/nouveau/nouveau_fence.c
+++ b/drivers/gpu/drm/nouveau/nouveau_fence.c
@@ -207,7 +207,7 @@ nouveau_fence_context_new(struct nouveau_channel *chan, 
struct nouveau_fence_cha
 int
 nouveau_fence_emit(struct nouveau_fence *fence)
 {
-       struct nouveau_channel *chan = fence->channel;
+       struct nouveau_channel *chan = unrcu_pointer(fence->channel);
        struct nouveau_fence_chan *fctx = chan->fence;
        struct nouveau_fence_priv *priv = (void*)chan->drm->fence;
        int ret;
-- 
2.41.0

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