sfdisk: make unhiding as complete as possible

It is unlikely anyone will ever need this, but I like idea commands being
complete.  The partition id's that can be unhide after this change are;

Hidden HPFS/NTFS
Hidden W95 FAT32
Hidden W95 FAT32 (LBA)
Hidden W95 FAT16 (LBA)

Signed-off-by: Sami Kerola <kerolasa@iki.fi>
docs: add missing options to sfdisk manual

And improve what is said about four of the dangerous options.

Signed-off-by: Sami Kerola <kerolasa@iki.fi>
dmesg: inform user --show-delta and iso8601 time format does not mix

References: http://marc.info/?l=util-linux-ng&m=137267606929951&w=2
Signed-off-by: Sami Kerola <kerolasa@iki.fi>
lib/loopdev: assigned value is never read [clang-analyzer]

Signed-off-by: Sami Kerola <kerolasa@iki.fi>
lib/mbsalign: initializations values are never read [clang-analyzer]

Signed-off-by: Sami Kerola <kerolasa@iki.fi>
ipcs: assigned values are never read [clang-analyzer]

Signed-off-by: Sami Kerola <kerolasa@iki.fi>
lscpu: fix memory leak [clang-analyzer]

Signed-off-by: Sami Kerola <kerolasa@iki.fi>
more: assigned value is never read [clang-analyzer]

Signed-off-by: Sami Kerola <kerolasa@iki.fi>
utmpdump: assigned values are never read [clang-analyzer]

Signed-off-by: Sami Kerola <kerolasa@iki.fi>
mkfs.cramfs: argument to free() is a constant address [clang-analyzer]

Signed-off-by: Sami Kerola <kerolasa@iki.fi>
eject: assigned value is never read [clang-analyzer]

Signed-off-by: Sami Kerola <kerolasa@iki.fi>
chfn: assigned value is never read [clang-analyzer]

Signed-off-by: Sami Kerola <kerolasa@iki.fi>
sfdisk: assigned value is never read [clang-analyzer]

Signed-off-by: Sami Kerola <kerolasa@iki.fi>
sulogin: fix memory leak [clang-analyzer]

And make code a little bit more robust.

Signed-off-by: Sami Kerola <kerolasa@iki.fi>
agetty: fix memory leak [clang-analyzer]

Signed-off-by: Sami Kerola <kerolasa@iki.fi>
ul: use correct types

Signed-off-by: Sami Kerola <kerolasa@iki.fi>
ul: use string printing function

Use of for loop and printing a string character by character is slower
than to print whole string with single function.

Signed-off-by: Sami Kerola <kerolasa@iki.fi>
column: dereference of null pointer [clang-analyzer]

Signed-off-by: Sami Kerola <kerolasa@iki.fi>
more: use variable lenght printf field width to print blanks

This makes program to run a little faster.

Signed-off-by: Sami Kerola <kerolasa@iki.fi>
sulogin: fix compiler warning

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