mc: use width/height of reference frame in warp_affine
Fixes a heap buffer overflow in emu_edge_c with clusterfuzz-testcase-minimized-dav1d_fuzzer_mt-5089954858795008 if the reference frame is smaller than the current frame. Credits to oss-fuzz.
Fixes a heap buffer overflow in emu_edge_c with clusterfuzz-testcase-minimized-dav1d_fuzzer_mt-5089954858795008 if the reference frame is smaller than the current frame. Credits to oss-fuzz.
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