drm/i915/guc: Allow preempt-client to be NULL

In the next patch, we may only conditionally allocate the preempt-client
if there is a global preempt context and so we need to be prepared in
case the preempt-client itself is NULL.

v2: Grep for more preempt_client.

Signed-off-by: Chris Wilson <[email protected]>
Cc: Michal Winiarski <[email protected]>
Cc: Arkadiusz Hiler <[email protected]>
Cc: Daniele Ceraolo Spurio <[email protected]>
Cc: Michel Thierry <[email protected]>
Cc: Michal Wajdeczko <[email protected]>
Reviewed-by: Mika Kuoppala <[email protected]>
Link: https://patchwork.freedesktop.org/patch/msgid/[email protected]
Reviewed-by: Michel Thierry <[email protected]>

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