drm/nouveau: Fix error pointer dereference in r535_gsp_msgq_recv()
If "rpc" is an error pointer then return directly. Otherwise it leads
to an error pointer dereference.
Fixes: 50f290053d79 ("drm/nouveau: support handling the return of large GSP message")
Signed-off-by: Dan Carpenter <dan.carpenter@linaro.org>
Acked-by: Zhi Wang <zhiw@nvidia.com>
Signed-off-by: Danilo Krummrich <dakr@kernel.org>
Link: https://patchwork.freedesktop.org/patch/msgid/b7052ac0-98e4-433b-ad58-f563bf51858c@stanley.mountain
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