cmd/fmt/internal/env: test failure case output

Signed-off-by: Colin Lacy <colinjlacy@gmail.com>

cmd/internal/env/env_test.go

@@ -4,7 +4,6 @@ import (
 	"bytes"
 	"fmt"
 	"io"
-	"os"
 	"strings"
 	"testing"
 
@@ -112,8 +111,7 @@ func TestCmdFlagsImpl_CheckEnvironmentVariables_ChildCommandAllEnvVars(t *testin
 	t.Setenv("OPA_CHILD_SECOND_STRING", "testing child")
 	t.Setenv("OPA_CHILD_SECOND_BOOL", "false")
 	if err := child.PreRunE(child, []string{}); err != nil {
-		fmt.Fprintf(os.Stdout, "unexpected error: %s", err.Error())
-		t.Fatalf("BONK")
+		t.Fatalf("unexpected error: %s", err.Error())
 	}
 	child.Run(child, []string{})
 	childOut := childWriter.String()