drm/i915: Satisfy smatch that a loop has at least one iteration

Smatch worries that the engine->mask may be 0 leading to the loop being
shortcircuited leaving the next pointer unset,

drivers/gpu/drm/i915/i915_active.c:667 i915_active_acquire_preallocate_barrier() error: uninitialized symbol 'next'.

Assert that mask is not 0 and smatch can then verify that next must be
initialised before use.

Signed-off-by: Chris Wilson <[email protected]>
Cc: Tvrtko Ursulin <[email protected]>
Reviewed-by: Matthew Auld <[email protected]>
Link: https://patchwork.freedesktop.org/patch/msgid/[email protected]

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