Commit 1b1a5088 for xz

commit 1b1a508859da7cd53a0567158b0fe9143d1408c1
Author: Ali Ahmet Memiş <aliamemis@disroot.org>
Date:   Sat Oct 24 21:57:29 2026 +0300

    xzdiff: Fix the one-operand case with the _z suffix

    The _z suffix was accepted when only one file was given, but the expr
    that removes the suffix requires a - or . before it. FILE became empty:

    $ xzdiff foo_z
    diff: '': No such file or directory

    Link: https://github.com/tukaani-project/xz/pull/258

diff --git a/src/scripts/xzdiff.in b/src/scripts/xzdiff.in
index 74c1d332..4aab4dd8 100644
--- a/src/scripts/xzdiff.in
+++ b/src/scripts/xzdiff.in
@@ -95,8 +95,10 @@ if test $# -eq 1; then
   # The FILE variable is used with eval, and shellcheck doesn't see that.
   # shellcheck disable=SC2034
   case $1 in
-    *[-.][zZ] | *_z | *[-.][gx]z | *[-.]bz2 | *[-.]lzma | *[-.]lz | *[-.]lzo | *[-.]zst | *[-.]lz4)
+    *[-.][zZ] | *[-.][gx]z | *[-.]bz2 | *[-.]lzma | *[-.]lz | *[-.]lzo | *[-.]zst | *[-.]lz4)
       FILE=`LC_ALL=C expr "X$1" : 'X\(.*\)[-.][abglmostxzZ24]*$'`;;
+    *_z)
+      FILE=`LC_ALL=C expr "X$1" : 'X\(.*\)_z$'`;;
     *.t[abglx]z)
       FILE=`LC_ALL=C expr "X$1" : 'X\(.*[-.]t\)[abglx]z$'`ar;;
     *.tbz2)