lib/alsa/AllowedFormat: use std::string_view

src/lib/alsa/AllowedFormat.cxx

@@ -54,7 +54,7 @@ AllowedFormat::AllowedFormat(StringView s)
 }
 
 std::forward_list<AllowedFormat>
-AllowedFormat::ParseList(StringView s)
+AllowedFormat::ParseList(std::string_view s)
 {
 	std::forward_list<AllowedFormat> list;
 	auto tail = list.before_begin();

src/lib/alsa/AllowedFormat.hxx

@@ -52,7 +52,7 @@ struct AllowedFormat {
 	 *
 	 * Throws std::runtime_error on error.
 	 */
-	static std::forward_list<AllowedFormat> ParseList(StringView s);
+	static std::forward_list<AllowedFormat> ParseList(std::string_view s);
 };
 
 std::string

src/output/plugins/AlsaOutputPlugin.cxx

@@ -471,7 +471,7 @@ AlsaOutput::SetAttribute(std::string &&name, std::string &&value)
 {
 	if (name == "allowed_formats") {
 		const std::lock_guard<Mutex> lock(attributes_mutex);
-		allowed_formats = Alsa::AllowedFormat::ParseList({value.data(), value.length()});
+		allowed_formats = Alsa::AllowedFormat::ParseList(value);
 #ifdef ENABLE_DSD
 	} else if (name == "dop") {
 		const std::lock_guard<Mutex> lock(attributes_mutex);