OSV-2020-1285 Use-of-uninitialized-value in ihevc_deblk_luma_vert_ssse3

OSS-Fuzz report: https://bugs.chromium.org/p/oss-fuzz/issues/detail?id=17009 Crash type: Use-of-uninitialized-value Crash state: ihevcdeblklumavertssse3 ihevcddeblkctb ihevcdprocess...