[linux] Output line is broken (unneeded backslash is added before the rest of the line) when filename contains backslash

[lvd2]

$ touch '1\2'
$ touch '\'
$ ./rhash -C '\' '1\2'
; Generated by RHash v1.4.6 on 2026-02-13 at 14:06.54
; Written by Kravchenko Aleksey (Akademgorodok) - http://rhash.sf.net/
;
;            0  14:03.59 2026-02-13 \
;            0  14:04.01 2026-02-13 1\2
\\\ 00000000
\1\\2 00000000
$ ./rhash -M '\' '1\2'
\d41d8cd98f00b204e9800998ecf8427e  \\
\d41d8cd98f00b204e9800998ecf8427e  1\\2

[rhash]

This behavior is implemented in #97 in the same way as GNU coreutils md5sum and sha1sum work.

To turn off bad characters escaping, use --printf option, e. g.:

rhash --printf '%{sha1} %p\n' <FILES...>