build: remove unused code spotted by the deadcode linter

backend/amazonclouddrive/amazonclouddrive.go

@@ -18,7 +18,6 @@ import (
 	"log"
 	"net/http"
 	"path"
-	"regexp"
 	"strings"
 	"time"
 
@@ -40,7 +39,6 @@ import (
 const (
 	folderKind      = "FOLDER"
 	fileKind        = "FILE"
-	assetKind       = "ASSET"
 	statusAvailable = "AVAILABLE"
 	timeFormat      = time.RFC3339 // 2014-03-07T22:31:12.173Z
 	minSleep        = 20 * time.Millisecond
@@ -138,9 +136,6 @@ func (f *Fs) Features() *fs.Features {
 	return f.features
 }
 
-// Pattern to match a acd path
-var matcher = regexp.MustCompile(`^([^/]*)(.*)$`)
-
 // parsePath parses an acd 'url'
 func parsePath(path string) (root string) {
 	root = strings.Trim(path, "/")