filter/convert: convert_filter_new() returns std::unique_ptr

src/filter/plugins/AutoConvertFilterPlugin.cxx

@@ -85,8 +85,8 @@ PreparedAutoConvertFilter::Open(AudioFormat &in_audio_format)
 	if (in_audio_format != child_audio_format) {
 		/* yes - create a convert_filter */
 
-		convert.reset(convert_filter_new(in_audio_format,
-						 child_audio_format));
+		convert = convert_filter_new(in_audio_format,
+					     child_audio_format);
 	}
 
 	return std::make_unique<AutoConvertFilter>(std::move(new_filter),

src/filter/plugins/ConvertFilterPlugin.cxx

@@ -117,13 +117,13 @@ convert_filter_prepare() noexcept
 	return std::make_unique<PreparedConvertFilter>();
 }
 
-Filter *
+std::unique_ptr<Filter>
 convert_filter_new(const AudioFormat in_audio_format,
 		   const AudioFormat out_audio_format)
 {
 	std::unique_ptr<ConvertFilter> filter(new ConvertFilter(in_audio_format));
 	filter->Set(out_audio_format);
-	return filter.release();
+	return filter;
 }
 
 void

src/filter/plugins/ConvertFilterPlugin.hxx

@@ -29,7 +29,7 @@ struct AudioFormat;
 std::unique_ptr<PreparedFilter>
 convert_filter_prepare() noexcept;
 
-Filter *
+std::unique_ptr<Filter>
 convert_filter_new(AudioFormat in_audio_format,
 		   AudioFormat out_audio_format);