docs: kdoc: properly handle empty enum arguments

Depending on how the enum proto is written, a comma at the end
may incorrectly make kernel-doc parse an arg like " ".

Strip spaces before checking if arg is empty.

Signed-off-by: Mauro Carvalho Chehab <mchehab+huawei@kernel.org>
Message-ID: <4182bfb7e5f5b4bbaf05cee1bede691e56247eaf.1773074166.git.mchehab+huawei@kernel.org>
Signed-off-by: Jonathan Corbet <corbet@lwn.net>
Message-ID: <640784283d52c5fc52ea597344ecd567e2fb6e22.1773770483.git.mchehab+huawei@kernel.org>

tools/lib/python/kdoc/kdoc_parser.py

@@ -810,9 +810,10 @@ class KernelDoc:
         member_set = set()
         members = KernRe(r'\([^;)]*\)').sub('', members)
         for arg in members.split(','):
-            if not arg:
-                continue
             arg = KernRe(r'^\s*(\w+).*').sub(r'\1', arg)
+            if not arg.strip():
+                continue
+
             self.entry.parameterlist.append(arg)
             if arg not in self.entry.parameterdescs:
                 self.entry.parameterdescs[arg] = self.undescribed