OSV-2026-30 Use-of-uninitialized-value in vp9_quantize_fp_avx2

OSS-Fuzz report: https://bugs.chromium.org/p/oss-fuzz/issues/detail?id=474614578 Crash type: Use-of-uninitialized-value Crash state: vp9quantizefpavx2 blockyrd vp9pickintermode...