[ruff] Enable RET and fix all violations (#9929)

esphome/components/lvgl/automation.py

@@ -85,8 +85,7 @@ async def action_to_code(
     async with LambdaContext(parameters=args, where=action_id) as context:
         for widget in widgets:
             await action(widget)
-    var = cg.new_Pvariable(action_id, template_arg, await context.get_lambda())
-    return var
+    return cg.new_Pvariable(action_id, template_arg, await context.get_lambda())
 
 
 async def update_to_code(config, action_id, template_arg, args):
@@ -354,8 +353,7 @@ async def widget_focus(config, action_id, template_arg, args):
 
         if config[CONF_FREEZE]:
             lv.group_focus_freeze(group, True)
-        var = cg.new_Pvariable(action_id, template_arg, await context.get_lambda())
-        return var
+        return cg.new_Pvariable(action_id, template_arg, await context.get_lambda())
 
 
 @automation.register_action(

esphome/components/lvgl/lv_validation.py

@@ -271,8 +271,7 @@ padding = LValidator(padding_validator, int32, retmapper=literal)
 
 
 def zoom_validator(value):
-    value = cv.float_range(0.1, 10.0)(value)
-    return value
+    return cv.float_range(0.1, 10.0)(value)
 
 
 def zoom_retmapper(value):

esphome/components/lvgl/styles.py

@@ -66,8 +66,7 @@ async def style_update_to_code(config, action_id, template_arg, args):
     async with LambdaContext(parameters=args, where=action_id) as context:
         await style_set(style, config)
 
-    var = cg.new_Pvariable(action_id, template_arg, await context.get_lambda())
-    return var
+    return cg.new_Pvariable(action_id, template_arg, await context.get_lambda())
 
 
 async def theme_to_code(config):

esphome/components/lvgl/widgets/__init__.py

@@ -189,7 +189,7 @@ class Widget:
         for matrix buttons
         :return:
         """
-        return None
+        return
 
     def get_max(self):
         return self.type.get_max(self.config)

esphome/components/lvgl/widgets/buttonmatrix.py

@@ -193,7 +193,7 @@ class ButtonMatrixType(WidgetType):
     async def to_code(self, w: Widget, config):
         lvgl_components_required.add("BUTTONMATRIX")
         if CONF_ROWS not in config:
-            return []
+            return
         text_list, ctrl_list, width_list, key_list = await get_button_data(
             config[CONF_ROWS], w
         )