Merge branch 'refine-the-choice-of-stream-related-functions-in-usage' of https:/...

* 'refine-the-choice-of-stream-related-functions-in-usage' of https://github.com/masatake/util-linux:
  Make the ways of using output stream consistent in usage()
  Use fputs instead of fprintf if possible

diff --cc misc-utils/findmnt.c
Simple merge

diff --cc misc-utils/lsblk.c
Simple merge

diff --cc sys-utils/umount.c
Simple merge