Log Message:
dpkg: updated to 1.22.4

1.22.4

* Code internals:
  - dpkg: Rename r variable for readlink() return value to symlink_len.
  - dpkg: Rename r variable for fd_read() return value to n.
  - dpkg-deb: Rename r variable for fd_read() return value to nread.
  - dpkg-deb: Rename r variables for fd_read() call chain return value to rc.
  - dpkg-split: Rename r variable for strtoimax() return value to ret.
  - libdpkg: Rename r variable for path_quote_filename() return to ret.
  - libdpkg: Rename r variable for fclose() return value to rc.
  - libdpkg: Rename r variables for printf()-like return values to n.
  - libdpkg: Handle tar long GNU names and links not being NUL terminated.
  - perl: Use qw() when importing symbols.
  - dpkg-gensymbols: Move foreach inlined array elements into a list.
  - dpkg-scansources: Fix newline breaks for ternary operators.
* Packaging:
  - Update copyright years.