all: apply modernisers

Signed-off-by: Ophestra <cat@gensokyo.uk>

internal/outcome/hsu.go

@@ -51,18 +51,16 @@ func (h *Hsu) ID() (int, error) {
 		cmd.Stderr = os.Stderr // pass through fatal messages
 		cmd.Env = make([]string, 0)
 		cmd.Dir = fhs.Root
-		var (
-			p         []byte
-			exitError *exec.ExitError
-		)
-
+		var p []byte
 		const step = "obtain uid from hsu"
 		if p, h.idErr = h.k.cmdOutput(cmd); h.idErr == nil {
 			h.id, h.idErr = strconv.Atoi(string(p))
 			if h.idErr != nil {
 				h.idErr = &hst.AppError{Step: step, Err: h.idErr, Msg: "invalid uid string from hsu"}
 			}
-		} else if errors.As(h.idErr, &exitError) && exitError != nil && exitError.ExitCode() == 1 {
+		} else if exitError, ok := errors.AsType[*exec.ExitError](h.idErr); ok &&
+			exitError != nil &&
+			exitError.ExitCode() == 1 {
 			// hsu prints an error message in this case
 			h.idErr = &hst.AppError{Step: step, Err: ErrHsuAccess}
 		} else if errors.Is(h.idErr, os.ErrNotExist) {