fs: remove file.Name() from interface

The only user was archiver.fileSaver.

internal/fs/fs_reader.go

@@ -232,7 +232,7 @@ func (r *readerFile) Close() error {
 var _ File = &readerFile{}
 
 // fakeFile implements all File methods, but only returns errors for anything
-// except Stat() and Name().
+// except Stat()
 type fakeFile struct {
 	name string
 	os.FileInfo
@@ -257,10 +257,6 @@ func (f fakeFile) Stat() (os.FileInfo, error) {
 	return f.FileInfo, nil
 }
 
-func (f fakeFile) Name() string {
-	return f.name
-}
-
 // fakeDir implements Readdirnames and Readdir, everything else is delegated to fakeFile.
 type fakeDir struct {
 	entries []os.FileInfo

internal/fs/interface.go

@@ -34,5 +34,4 @@ type File interface {
 
 	Readdirnames(n int) ([]string, error)
 	Stat() (os.FileInfo, error)
-	Name() string
 }