CCITTFaxStream: Fix uninitialized memory read in broken files

oss-fuzz/8795
7 jobs for fix_more_unitialized in 4 minutes and 40 seconds (queued for 1 second)
Status Job ID Name Coverage
  Build
passed #6681363
build

00:04:29

passed #6681368
build_android

00:00:46

passed #6681364
build_clang_libcpp

00:04:39

passed #6681367
build_clazy

00:04:17

passed #6681366
build_mingw64_fedora

00:03:04

passed #6681365
build_ubuntu_16_04

00:02:30

passed #6681362
clang_format

00:01:09