ci: fix regex in guideline_check.py

Also match _ in file names.

Signed-off-by: Anas Nashif <anas.nashif@intel.com>
diff --git a/scripts/ci/guideline_check.py b/scripts/ci/guideline_check.py
index d55fa75..b85f5e3 100755
--- a/scripts/ci/guideline_check.py
+++ b/scripts/ci/guideline_check.py
@@ -26,7 +26,7 @@
 
 
 def parse_coccinelle(contents: str, violations: dict):
-    reg = re.compile("([a-zA-Z0-9/]*\\.[ch]:[0-9]*)(:[0-9\\-]*: )(.*)")
+    reg = re.compile("([a-zA-Z0-9_/]*\\.[ch]:[0-9]*)(:[0-9\\-]*: )(.*)")
     for line in contents.split("\n"):
         r = reg.match(line)
         if r: