Path: convert fs_charset_to_utf8() to static method Path::ToUTF8()

src/Mapper.cxx

@@ -246,7 +246,11 @@ map_fs_to_utf8(const char *path_fs)
 	while (path_fs[0] == G_DIR_SEPARATOR)
 		++path_fs;
 
-	return fs_charset_to_utf8(path_fs);
+	const std::string path_utf8 = Path::ToUTF8(path_fs);
+	if (path_utf8.empty())
+		return nullptr;
+
+	return g_strdup(path_utf8.c_str());
 }
 
 const Path &