include/debug: fix typo

Signed-off-by: Karel Zak <kzak@redhat.com>
tests: add blkdiscard offsets test

Signed-off-by: Federico Simoncelli <fsimonce@redhat.com>
blkdiscard: fail on sector misalignment
blkdiscard: add support for steps and progress

Signed-off-by: Federico Simoncelli <fsimonce@redhat.com>
blkdiscard: update man page

Signed-off-by: Karel Zak <kzak@redhat.com>
blkdiscard: fix includes

Signed-off-by: Karel Zak <kzak@redhat.com>
build-sys: old glibc requires -lrt clock_gettime()

Signed-off-by: Karel Zak <kzak@redhat.com>
build-sys: properly check for -lrt

Signed-off-by: Karel Zak <kzak@redhat.com>