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lavapipe: Address sanitizer reports memory leak of lp_fence structs

With the introduction of KHR_timeline_semaphore in 94a49828 lavapipe address sanitizer reports memory leaks of lp_fence structs.

In src/gallium/frontends/lavapipe/lvp_device.c:1186 the lp_fence is copied multiple times into the timelines and the lvp_fence without using device->pscreen->fence_reference() to increase/decrease the reference count of the fence. Also when destroying the timelines the reference counts are not decreased, which causes the fences to leak.

cc @zmike

patch.diff

Edited by Thomas Wagner
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