frame-mt: do not derive_warpmv intrabc blocks
Fixes an use-of-uninitialized-value in decode_b() with clusterfuzz-testcase-minimized-dav1d_fuzzer_mt-5674585370918912. Credits to oss-fuzz.
Edited by Janne Grunau
Fixes an use-of-uninitialized-value in decode_b() with clusterfuzz-testcase-minimized-dav1d_fuzzer_mt-5674585370918912. Credits to oss-fuzz.
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