Merge branch 'analyzer2' of https://github.com/t-8ch/util-linux

* 'analyzer2' of https://github.com/t-8ch/util-linux:
  libblkid: (probe) handle probe without chain gracefully
  libsmartcols: (cell) consistently handle NULL argument
  lib/idcache: always gracefully handle null cache
  script-playutils: close filestream in case ignore_line() fails
  lib/colors: correct documentation of colors_add_scheme()
  treewide: use reallocarray to allocated memory that will be reallocated