db,storage: pass std::string_view to PathTraits::Build()

src/db/plugins/simple/Song.cxx

@@ -41,7 +41,7 @@ Song::GetURI() const noexcept
 		return filename;
 	else {
 		const char *path = parent.GetPath();
-		return PathTraitsUTF8::Build(path, filename.c_str());
+		return PathTraitsUTF8::Build(path, filename);
 	}
 }
 

src/db/plugins/upnp/UpnpDatabasePlugin.cxx

@@ -397,8 +397,7 @@ UpnpDatabase::BuildPath(const ContentDirectoryService &server,
 		if (path.empty())
 			path = dirent.name;
 		else
-			path = PathTraitsUTF8::Build(dirent.name.c_str(),
-						     path.c_str());
+			path = PathTraitsUTF8::Build(dirent.name, path);
 	}
 
 	return PathTraitsUTF8::Build(server.getFriendlyName(),

src/db/update/Walk.cxx

@@ -322,7 +322,7 @@ UpdateWalk::UpdateDirectory(Directory &directory,
 
 	try {
 		Mutex mutex;
-		auto is = InputStream::OpenReady(PathTraitsUTF8::Build(storage.MapUTF8(directory.GetPath()).c_str(),
+		auto is = InputStream::OpenReady(PathTraitsUTF8::Build(storage.MapUTF8(directory.GetPath()),
 								       ".mpdignore").c_str(),
 						 mutex);
 		child_exclude_list.Load(std::move(is));