cmd: Return error in readPassword

The returned error was always nil.

Replaced Wrap by WithStack because the function name was stale.

cmd/restic/global.go

@@ -280,7 +280,7 @@ func readPassword(in io.Reader) (password string, err error) {
 	sc := bufio.NewScanner(in)
 	sc.Scan()
 
-	return sc.Text(), errors.Wrap(err, "Scan")
+	return sc.Text(), errors.WithStack(sc.Err())
 }
 
 // readPasswordTerminal reads the password from the given reader which must be a

cmd/restic/global_test.go

@@ -5,6 +5,7 @@ import (
 	"path/filepath"
 	"testing"
 
+	"github.com/restic/restic/internal/errors"
 	rtest "github.com/restic/restic/internal/test"
 )
 
@@ -22,6 +23,16 @@ func Test_PrintFunctionsRespectsGlobalStdout(t *testing.T) {
 	}
 }
 
+type errorReader struct{ err error }
+
+func (r *errorReader) Read([]byte) (int, error) { return 0, r.err }
+
+func TestReadPassword(t *testing.T) {
+	want := errors.New("foo")
+	_, err := readPassword(&errorReader{want})
+	rtest.Assert(t, errors.Is(err, want), "wrong error %v", err)
+}
+
 func TestReadRepo(t *testing.T) {
 	tempDir := rtest.TempDir(t)