OSV-2025-906 Use-of-uninitialized-value in QImage::pixel

OSS-Fuzz report: https://bugs.chromium.org/p/oss-fuzz/issues/detail?id=461199967 Crash type: Use-of-uninitialized-value Crash state: QImage::pixel XCFImageFormat::copyGrayAToRGB XCFImageFormat::copyLayerToImage...