Merge branch 'lsfd-blkdev' of https://github.com/masatake/util-linux

* 'lsfd-blkdev' of https://github.com/masatake/util-linux:
  tests: (lsfd) call ts_skip_nonroot earlier
  lsfd: fix a typo in comment
  lsfd: declare local variables at the beginning of block
  tests: (lsfd) add a case for listing a fd opening a block device
  tests: (lsfd) add a factory for opening a block device to the helper command
  lsfd: use the list of block devices in /proc/devices for decoding SOURCE column
  lsfd: add a helper function for reading bdevs in /prode/devices
  lsfd: move the code for reading /proc/devices to lsfd.c