command/file, storage/{nfs,smbclient}: use PathTraitsFS::IsSpecialFilename()

src/command/FileCommands.cxx

@@ -50,9 +50,7 @@ gcc_pure
 static bool
 SkipNameFS(PathTraitsFS::const_pointer_type name_fs) noexcept
 {
-	return name_fs[0] == '.' &&
-		(name_fs[1] == 0 ||
-		 (name_fs[1] == '.' && name_fs[2] == 0));
+	return PathTraitsFS::IsSpecialFilename(name_fs);
 }
 
 gcc_pure

src/storage/plugins/NfsStorage.cxx

@@ -307,9 +307,7 @@ gcc_pure
 static bool
 SkipNameFS(PathTraitsFS::const_pointer_type name) noexcept
 {
-	return name[0] == '.' &&
-		(name[1] == 0 ||
-		 (name[1] == '.' && name[2] == 0));
+	return PathTraitsFS::IsSpecialFilename(name);
 }
 
 static void

src/storage/plugins/SmbclientStorage.cxx

@@ -144,11 +144,9 @@ SmbclientStorage::OpenDirectory(const char *uri_utf8)
 
 gcc_pure
 static bool
-SkipNameFS(const char *name) noexcept
+SkipNameFS(PathTraitsFS::const_pointer_type name) noexcept
 {
-	return name[0] == '.' &&
-		(name[1] == 0 ||
-		 (name[1] == '.' && name[2] == 0));
+	return PathTraitsFS::IsSpecialFilename(name);
 }
 
 SmbclientDirectoryReader::~SmbclientDirectoryReader()