docs: kdoc: better handle source when producing YAML output

The current logic was storing symbols source code on a list,
not linked to the actual KdocItem. While this works fine when
kernel-doc markups are OK, on places where there is a "/**"
without a valid kernel-doc markup, it ends that the 1:1 match
between source code and KdocItem doesn't happen, causing
problems to generate the YAML output.

Fix it by storing the source code directly into the KdocItem
structure.

This shouldn't affect performance or memory footprint, except
when --yaml option is used.

While here, add a __repr__() function for KdocItem, as it
helps debugging it.

Signed-off-by: Mauro Carvalho Chehab <mchehab+huawei@kernel.org>
Signed-off-by: Jonathan Corbet <corbet@lwn.net>
Message-ID: <77902dafabb5c3250486aa2dc1568d5fafa95c5b.1774256269.git.mchehab+huawei@kernel.org>

tools/lib/python/kdoc/kdoc_item.py

@@ -14,7 +14,8 @@ class KdocItem:
     then pass into the output modules.
     """
 
-    def __init__(self, name, fname, type, start_line, **other_stuff):
+    def __init__(self, name, fname, type, start_line,
+                 **other_stuff):
         self.name = name
         self.fname = fname
         self.type = type
@@ -60,6 +61,9 @@ class KdocItem:
     def __getitem__(self, key):
         return self.get(key)
 
+    def __repr__(self):
+        return f"KdocItem({self.name}, {self.fname}, {self.type}, {self.declaration_start_line})"
+
     @classmethod
     def from_dict(cls, d):
         """Create a KdocItem from a plain dict."""