docs: kdoc: remove a useless empty capture group

The is_define_proto case in dump_function() uses a regex with an empty
capture group - () - that has no use; just take it out.

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

Author: Jonathan Corbet

scripts/lib/kdoc/kdoc_parser.py

@@ -972,11 +972,11 @@ def dump_function(self, ln, prototype):
         found = False
 
         if is_define_proto:
-            r = KernRe(r'^()(' + name + r')\s+')
+            r = KernRe(r'^(' + name + r')\s+')
 
             if r.search(prototype):
                 return_type = ''
-                declaration_name = r.group(2)
+                declaration_name = r.group(1)
                 func_macro = True
 
                 found = True