When we need to perform format conversion, we use temporary surface
allocated with vlVaHandleSurfaceAllocate. If the driver requires
clearing the surface on allocation, it will create a fence that
must be destroyed later.
Fixes: 0f20a3a4f1 ("frontends/va: Add surface pipe_fence for vl_compositor rendering")
Closes: https://gitlab.freedesktop.org/mesa/mesa/-/issues/13198
Reported-by: Mariusz Białończyk <manio@skyboo.net>
Tested-by: Mariusz Białończyk <manio@skyboo.net>
Reviewed-by: Ruijing Dong <ruijing.dong@amd.com>
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/36040>
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