Fix minor irritants to pylint/flake8 et al.

(Yes, these need to be guarded by the Python tests. That's a work in
progress, a series that's quite likely to follow once I finish this
Sphinx project. Please pardon the temporary irritation.)

Signed-off-by: John Snow <jsnow@redhat.com>
Reviewed-by: Markus Armbruster <armbru@redhat.com>
---
 scripts/qapi/introspect.py | 8 ++++----
 scripts/qapi/schema.py     | 6 +++---
 scripts/qapi/visit.py      | 5 +++--
 3 files changed, 10 insertions(+), 9 deletions(-)

diff --git a/scripts/qapi/introspect.py b/scripts/qapi/introspect.py
index 86c075a6ad2..ac14b20f308 100644
--- a/scripts/qapi/introspect.py
+++ b/scripts/qapi/introspect.py
@@ -27,8 +27,8 @@
 from .schema import (
     QAPISchema,
     QAPISchemaAlternatives,
-    QAPISchemaBranches,
     QAPISchemaArrayType,
+    QAPISchemaBranches,
     QAPISchemaBuiltinType,
     QAPISchemaEntity,
     QAPISchemaEnumMember,
@@ -233,9 +233,9 @@ def _use_type(self, typ: QAPISchemaType) -> str:
             typ = type_int
         elif (isinstance(typ, QAPISchemaArrayType) and
               typ.element_type.json_type() == 'int'):
-            type_intList = self._schema.lookup_type('intList')
-            assert type_intList
-            typ = type_intList
+            type_intlist = self._schema.lookup_type('intList')
+            assert type_intlist
+            typ = type_intlist
         # Add type to work queue if new
         if typ not in self._used_types:
             self._used_types.append(typ)
diff --git a/scripts/qapi/schema.py b/scripts/qapi/schema.py
index 721c470d2b8..d65c35f6ee6 100644
--- a/scripts/qapi/schema.py
+++ b/scripts/qapi/schema.py
@@ -730,6 +730,7 @@ def set_defined_in(self, name: str) -> None:
         for v in self.variants:
             v.set_defined_in(name)
 
+    # pylint: disable=unused-argument
     def check(
             self, schema: QAPISchema, seen: Dict[str, QAPISchemaMember]
     ) -> None:
@@ -1166,7 +1167,7 @@ def _def_definition(self, defn: QAPISchemaDefinition) -> None:
                 defn.info, "%s is already defined" % other_defn.describe())
         self._entity_dict[defn.name] = defn
 
-    def lookup_entity(self,name: str) -> Optional[QAPISchemaEntity]:
+    def lookup_entity(self, name: str) -> Optional[QAPISchemaEntity]:
         return self._entity_dict.get(name)
 
     def lookup_type(self, name: str) -> Optional[QAPISchemaType]:
@@ -1302,11 +1303,10 @@ def _make_implicit_object_type(
         name = 'q_obj_%s-%s' % (name, role)
         typ = self.lookup_entity(name)
         if typ:
-            assert(isinstance(typ, QAPISchemaObjectType))
+            assert isinstance(typ, QAPISchemaObjectType)
             # The implicit object type has multiple users.  This can
             # only be a duplicate definition, which will be flagged
             # later.
-            pass
         else:
             self._def_definition(QAPISchemaObjectType(
                 name, info, None, ifcond, None, None, members, None))
diff --git a/scripts/qapi/visit.py b/scripts/qapi/visit.py
index e766acaac92..12f92e429f6 100644
--- a/scripts/qapi/visit.py
+++ b/scripts/qapi/visit.py
@@ -280,8 +280,9 @@ def gen_visit_alternate(name: str,
         abort();
     default:
         assert(visit_is_input(v));
-        error_setg(errp, "Invalid parameter type for '%%s', expected: %(name)s",
-                         name ? name : "null");
+        error_setg(errp,
+                   "Invalid parameter type for '%%s', expected: %(name)s",
+                   name ? name : "null");
         /* Avoid passing invalid *obj to qapi_free_%(c_name)s() */
         g_free(*obj);
         *obj = NULL;
-- 
2.45.0