[PATCH] drm/amdgpu: Fix a NULL deref in amdgpu_vm_add_prt_cb()

[Dan Carpenter]

We accidentally dereference "cb" if the kmalloc() fails.

Fixes: 451bc8eb8fe6 ("drm/amdgpu: fix PRT teardown on VM fini v3")
Signed-off-by: Dan Carpenter <dan.carpen...@oracle.com>

diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_vm.c 
b/drivers/gpu/drm/amd/amdgpu/amdgpu_vm.c
index 0235d7933efd..45a1bcfc41f7 100644
--- a/drivers/gpu/drm/amd/amdgpu/amdgpu_vm.c
+++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_vm.c
@@ -1518,7 +1518,7 @@ static void amdgpu_vm_add_prt_cb(struct amdgpu_device 
*adev,
                if (fence)
                        dma_fence_wait(fence, false);
 
-               amdgpu_vm_prt_put(cb->adev);
+               amdgpu_vm_prt_put(adev);
        } else {
                cb->adev = adev;
                if (!fence || dma_fence_add_callback(fence, &cb->cb,
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