qapi/schema: assert info is present when necessary

QAPISchemaInfo arguments can often be None because built-in definitions
don't have such information.  The type hint can only be
Optional[QAPISchemaInfo] then.  But, mypy gets upset about all the
places where we exploit that it can't actually be None there.  Add
assertions that will help mypy over the hump, to enable adding type
hints in a forthcoming commit.

Signed-off-by: John Snow <jsnow@redhat.com>
Reviewed-by: Markus Armbruster <armbru@redhat.com>
Signed-off-by: Markus Armbruster <armbru@redhat.com>
Message-ID: <20240315152301.3621858-15-armbru@redhat.com>

scripts/qapi/schema.py

@@ -751,6 +751,7 @@ def describe(self, info):
             else:
                 assert False
 
+        assert info is not None
         if defined_in != info.defn_name:
             return "%s '%s' of %s '%s'" % (role, self.name, meta, defined_in)
         return "%s '%s'" % (role, self.name)
@@ -841,6 +842,7 @@ def __init__(self, name, info, doc, ifcond, features,
         self.coroutine = coroutine
 
     def check(self, schema):
+        assert self.info is not None
         super().check(schema)
         if self._arg_type_name:
             arg_type = schema.resolve_type(