qapi: Fix a botched type annotation

Mypy is unhappy:

    $ mypy --config-file=scripts/qapi/mypy.ini `git-ls-files scripts/qapi/\*py`
    scripts/qapi/common.py:208: error: Function is missing a return type annotation
    scripts/qapi/common.py:227: error: Returning Any from function declared to return "str"

Messed up in commit ccea6a8 "qapi: Factor common recursion out of
cgen_ifcond(), docgen_ifcond()".  Tidy up.

Signed-off-by: Markus Armbruster <[email protected]>
Message-Id: <[email protected]>
Reviewed-by: Marc-André Lureau <[email protected]>

Author: Markus Armbruster

scripts/qapi/common.py

@@ -205,7 +205,8 @@ def gen_ifcond(ifcond: Optional[Union[str, Dict[str, Any]]],
                cond_fmt: str, not_fmt: str,
                all_operator: str, any_operator: str) -> str:
 
-    def do_gen(ifcond: Union[str, Dict[str, Any]], need_parens: bool):
+    def do_gen(ifcond: Union[str, Dict[str, Any]],
+               need_parens: bool) -> str:
         if isinstance(ifcond, str):
             return cond_fmt % ifcond
         assert isinstance(ifcond, dict) and len(ifcond) == 1