oss-fuzz: Assertion `f->frame_hdr.txfm_mode == TX_LARGEST' failed

reproduce with ./build-asan/tests/dav1d_fuzzer clusterfuzz-testcase-minimized-dav1d_fuzzer-5733641993322496

Error parsing frame header
dav1d_fuzzer: ../src/decode.c:622: read_vartx_tree: Assertion `f->frame_hdr.txfm_mode == TX_LARGEST' failed.

Edited Oct 23, 2018 by Janne Grunau

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