oss-fuzz: Assertion `dc <= (1 << BITDEPTH) - 1' failed

reproduce with ./build-asan/tests/dav1d_fuzzer clusterfuzz-testcase-minimized-dav1d_fuzzer-5762861192708096

dav1d_fuzzer: ../src/ipred.c:44: splat_dc: Assertion `dc <= (1 << BITDEPTH) - 1' failed.

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