docs: kdoc: remove some dead code in dump_typedef()

The regex in this block of code makes no sense, and a quick test shows that
it never matches anything; simply delete the code.

No output changes.

Signed-off-by: Jonathan Corbet <corbet@lwn.net>

Author: Jonathan Corbet

scripts/lib/kdoc/kdoc_parser.py

@@ -1060,11 +1060,6 @@ def dump_typedef(self, ln, proto):
                                     purpose=self.entry.declaration_purpose)
             return
 
-        # Handle nested parentheses or brackets
-        r = KernRe(r'(\(*.\)\s*|\[*.\]\s*);$')
-        while r.search(proto):
-            proto = r.sub('', proto)
-
         # Parse simple typedefs
         r = KernRe(r'typedef.*\s+(\w+)\s*;')
         if r.match(proto):