drm/amdgpu: pass NULL pointer instead of 0

Fixes: c030f2e4 ("drm/amdgpu: add amdgpu_ras.c to support ras (v2)")
Signed-off-by: NNirmoy Das <nirmoy.das@amd.com>
Reviewed-by: NGuchun Chen <guchun.chen@amd.com>
Signed-off-by: NAlex Deucher <alexander.deucher@amd.com>

drivers/gpu/drm/amd/amdgpu/amdgpu_ras.c

@@ -1570,7 +1570,7 @@ static void amdgpu_ras_do_recovery(struct work_struct *work)
 	}
 
 	if (amdgpu_device_should_recover_gpu(ras->adev))
-		amdgpu_device_gpu_recover(ras->adev, 0);
+		amdgpu_device_gpu_recover(ras->adev, NULL);
 	atomic_set(&ras->in_recovery, 0);
 }