Fix macOS builds (#3728)

pkg/disk/type_darwin.go

@@ -1,36 +0,0 @@
-// +build darwin
-
-/*
- * Minio Cloud Storage, (C) 2015 Minio, Inc.
- *
- * Licensed under the Apache License, Version 2.0 (the "License");
- * you may not use this file except in compliance with the License.
- * You may obtain a copy of the License at
- *
- *     http://www.apache.org/licenses/LICENSE-2.0
- *
- * Unless required by applicable law or agreed to in writing, software
- * distributed under the License is distributed on an "AS IS" BASIS,
- * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
- * See the License for the specific language governing permissions and
- * limitations under the License.
- */
-
-package disk
-
-import "strconv"
-
-// fsType2StrinMap - list of filesystems supported by donut
-var fsType2StringMap = map[string]string{
-	"11": "HFS",
-}
-
-// getFSType returns the filesystem type of the underlying mounted filesystem
-func getFSType(ftype int64) string {
-	fsTypeHex := strconv.FormatInt(ftype, 16)
-	fsTypeString, ok := fsType2StringMap[fsTypeHex]
-	if !ok {
-		return "UNKNOWN"
-	}
-	return fsTypeString
-}