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Initialize f->lf.level during allocation to prevent uninitialized memory usage

Jordan M requested to merge montytyper/dav1d:initialise_lf_level into master

Test case in Issue #131 (closed) reveals a separate use of uninitialized array on WSL with GCC 8.1. Initializing when we allocate the array will fix uninitialized usage on all codepaths. Valgrind screenshot of issue and stack trace

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