xen/scripts: Fix regex syntax warnings with Python 3.12

Same fix than commit 826a9eb072 (tools: Fix regex syntax warnings with Python 3.12).

It clears out the warning:

```
$ xen/scripts/xen-analysis.py
xen/scripts/xen_analysis/cppcheck_analysis.py:94: SyntaxWarning: invalid escape sequence '\*'
  comment_line_starts = re.match('^[ \t]*/\*.*$', line)
```

The  warning appears only the first time the command is run, then it disappears.

Fixes: 02b26c02c7 (xen/scripts: add cppcheck tool to the xen-analysis.py script)
Signed-off-by: Ariel Otilibili <Ariel.Otilibili-Anieli@eurecom.fr>
Reviewed-by: Luca Fancellu <luca.fancellu@arm.com>
--
Cc: Andrew Cooper <andrew.cooper3@citrix.com>
Cc: Anthony PERARD <anthony.perard@vates.tech>
Cc: Michal Orzel <michal.orzel@amd.com>
Cc: Jan Beulich <jbeulich@suse.com>
Cc: Julien Grall <julien@xen.org>
Cc: "Roger Pau Monné" <roger.pau@citrix.com>
Cc: Stefano Stabellini <sstabellini@kernel.org>

diff --git a/xen/scripts/xen_analysis/cppcheck_analysis.py b/xen/scripts/xen_analysis/cppcheck_analysis.py
index ce7bda91b6f3f27248a28180406e77e8b42ad792..532a14b0ad6d6f0b246b98f9a9c223cd7a3a587b 100644 (file)
--- a/xen/scripts/xen_analysis/cppcheck_analysis.py
+++ b/xen/scripts/xen_analysis/cppcheck_analysis.py
@@ -91,7 +91,7 @@ def __generate_suppression_list(out_file):
                         line = header_content[tmp_line]
                         # Matches a line with just optional spaces/tabs and the
                         # start of a comment '/*'
-                        comment_line_starts = re.match('^[ \t]*/\*.*$', line)
+                        comment_line_starts = re.match(r'^[ \t]*/\*.*$', line)
                         # Matches a line with text and the end of a comment '*/'
                         comment_line_stops = re.match(r'^.*\*/$', line)
                         if (not comment_section) and comment_line_starts: