filter/Plugin: eliminate filter_new()

src/filter/FilterPlugin.cxx

@@ -28,14 +28,6 @@
 #include <assert.h>
 
 std::unique_ptr<PreparedFilter>
-filter_new(const FilterPlugin *plugin, const ConfigBlock &block)
-{
-	assert(plugin != nullptr);
-
-	return plugin->init(block);
-}
-
-std::unique_ptr<PreparedFilter>
 filter_configured_new(const ConfigBlock &block)
 {
 	const char *plugin_name = block.GetBlockValue("plugin");
@@ -47,5 +39,5 @@ filter_configured_new(const ConfigBlock &block)
 		throw FormatRuntimeError("No such filter plugin: %s",
 					 plugin_name);
 
-	return filter_new(plugin, block);
+	return plugin->init(block);
 }

src/filter/FilterPlugin.hxx

@@ -41,18 +41,6 @@ struct FilterPlugin {
 };
 
 /**
- * Creates a new instance of the specified filter plugin.
- *
- * Throws std::runtime_error on error.
- *
- * @param plugin the filter plugin
- * @param block configuration section
- */
-std::unique_ptr<PreparedFilter>
-filter_new(const FilterPlugin *plugin,
-	   const ConfigBlock &block);
-
-/**
  * Creates a new filter, loads configuration and the plugin name from
  * the specified configuration section.
  *