vkr: fix cpu sync cleanup at context destroy

Ryan Neph requested to merge ryanneph/virglrenderer:fix-cpu-sync-free into master

Loop variable had the wrong type, so list iteration was bugged.

Signed-off-by: Ryan Neph ryanneph@google.com Fixes: 5de77732 ("vkr: use sync_queue mapping in context_submit_fence")

/cc @zzyiwei

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