die: linter feedback fixes.

die/README.md

@@ -1,12 +0,0 @@
-Simple fatal utilities for Go programs.
-
-```
-	result, err := doSomething()
-	die.If(err)
-
-	ok := processResult(result)
-	if !ok {
-		die.With("failed to process result %s", result.Name)
-	}
-```
-

die/die.go

@@ -1,4 +1,5 @@
-// Package die contains utilities for fatal error handling.
+// Package die contains utilities for fatal error handling. It
+// presents simple fatal utilities for Go programs.
 package die
 
 import (
@@ -15,15 +16,15 @@ func If(err error) {
 }
 
 // With prints the message to stderr, appending a newline, and exits.
-func With(fstr string, args ...interface{}) {
+func With(fstr string, args any) {
 	out := fmt.Sprintf("[!] %s\n", fstr)
-	fmt.Fprintf(os.Stderr, out, args...)
+	fmt.Fprintf(os.Stderr, out, args)
 	os.Exit(1)
 }
 
 // When prints the error to stderr and exits if cond is true.
-func When(cond bool, fstr string, args ...interface{}) {
+func When(cond bool, fstr string, args any) {
 	if cond {
-		With(fstr, args...)
+		With(fstr, args)
 	}
 }