[clang] [libclang/python] Fix some type errors, add type annotations (PR #98745)

[Jannick Kremer via cfe-commits]

================
@@ -3895,28 +3932,28 @@ def register_function(lib, item, ignore_errors):
         func.errcheck = item[3]
 
 
-def register_functions(lib, ignore_errors):
+def register_functions(lib: CDLL, ignore_errors: bool) -> None:
     """Register function prototypes with a libclang library instance.
 
     This must be called as part of library instantiation so Python knows how
     to call out to the shared library.
     """
 
-    def register(item):
-        return register_function(lib, item, ignore_errors)
+    def register(item: LibFunc) -> None:
+        register_function(lib, item, ignore_errors)
----------------
DeinAlptraum wrote:

`return` removed since `register_function()` doesn't return anything anyway.

https://github.com/llvm/llvm-project/pull/98745