oss-fuzz: Assertion `0 < f' failed in `int od_ec_decode_bool_q15(od_ec_dec *, unsigned int)` msac.c:187
reproduce with ./dav1d_fuzzer clusterfuzz-testcase-minimized-dav1d_fuzzer-5681086273683456
clusterfuzz-testcase-minimized-dav1d_fuzzer-5681086273683456