Address CodeRabbit review and fix CI on embedded-vnc

client/vnc/server/console_user_windows.go

@@ -1,13 +1,15 @@
 package server
 
-// consoleHasInteractiveUser returns true when there is a logged-in user
-// session on the box. At the lock/login screen WTSQueryUserName is empty,
-// which means there is nobody to display an approval prompt to. Callers
-// should decline without waiting on the broker in that case.
-func consoleHasInteractiveUser() bool {
+// interactiveUserError returns nil when there is a logged-in user session
+// on the box. At the lock/login screen WTSQueryUserName is empty, which
+// means there is nobody to display an approval prompt to.
+func interactiveUserError() error {
 	sid := getActiveSessionID()
 	if sid == 0 {
-		return false
+		return errNoConsoleUser
 	}
-	return wtsSessionHasUser(sid)
+	if !wtsSessionHasUser(sid) {
+		return errNoConsoleUser
+	}
+	return nil
 }