ofz-8657: Undefined-shift in JBIG2Stream::readCodeTableSeg

https://bugs.chromium.org/p/oss-fuzz/issues/detail?id=8657
6 jobs from ofz-8657 in 8 minutes and 33 seconds (queued for 2 seconds)
latest
Status Job ID Name Coverage
  Build
passed #90204
build

00:05:19

passed #90209
build_android

00:02:47

passed #90205
build_clang_libcpp

00:05:20

passed #90208
build_clazy

00:04:38

passed #90206
build_gcc_49

00:07:13

passed #90207
build_mingw64_fedora

00:08:32