tools: ignore root element explicitly in check-version-history

Currently these messages (broken for length)

    2025-08-20T12:04:15.9609277Z
    /home/runner/work/systemd/systemd/tools/check-version-history.py:26:
    FutureWarning: This search incorrectly ignores the root element, and will be fixed in a future version.
    If you rely on the current behaviour, change it to './/funcprototype/funcdef/function'

can be seen in CI output. So let's apply the suggestion.

diff --git a/tools/check-version-history.py b/tools/check-version-history.py
index dce2b6abd16d4cd6156634f1cb8d31b1cd21a86f..db32b6920ab52261007fc813d64eb41e32f70ede 100755 (executable)
--- a/tools/check-version-history.py
+++ b/tools/check-version-history.py
@@ -23,7 +23,7 @@ def find_undocumented_functions(pages, ignorelist):
         assert pagetree.getroot().tag == "refentry"
 
         hist_section = pagetree.find("refsect1[title='History']")
-        for func in pagetree.findall("//funcprototype/funcdef/function"):
+        for func in pagetree.findall(".//funcprototype/funcdef/function"):
             path = f"./refsynopsisdiv/funcsynopsis/funcprototype/funcdef/function[.='{func.text}']"
             assert pagetree.findall(path) == [func]