playlist/Registry: add FindPlaylistPluginBySuffix()

src/playlist/PlaylistRegistry.cxx

@@ -274,15 +274,15 @@ playlist_list_open_stream(InputStreamPtr &&is, const char *uri)
 	return nullptr;
 }
 
-bool
-playlist_suffix_supported(const char *suffix) noexcept
+const PlaylistPlugin *
+FindPlaylistPluginBySuffix(const char *suffix) noexcept
 {
 	assert(suffix != nullptr);
 
 	playlist_plugins_for_each_enabled(plugin) {
 		if (plugin->SupportsSuffix(suffix))
-			return true;
+			return plugin;
 	}
 
-	return false;
+	return nullptr;
 }

src/playlist/PlaylistRegistry.hxx

@@ -78,12 +78,19 @@ playlist_list_open_stream_suffix(InputStreamPtr &&is, const char *suffix);
 std::unique_ptr<SongEnumerator>
 playlist_list_open_stream(InputStreamPtr &&is, const char *uri);
 
+gcc_pure
+const PlaylistPlugin *
+FindPlaylistPluginBySuffix(const char *suffix) noexcept;
+
 /**
  * Determines if there is a playlist plugin which can handle the
  * specified file name suffix.
  */
 gcc_pure
-bool
-playlist_suffix_supported(const char *suffix) noexcept;
+inline bool
+playlist_suffix_supported(const char *suffix) noexcept
+{
+	return FindPlaylistPluginBySuffix(suffix) != nullptr;
+}
 
 #endif