https://github.com/Pulse-Eight/libcec/pull/599

From 452b2049b2ee3e73968c603e5524b2d349ac0c3e Mon Sep 17 00:00:00 2001
From: psykose <alice@ayaya.dev>
Date: Sat, 9 Apr 2022 17:59:11 +0000
Subject: [PATCH] cecloader.h: fix null return

returning NULL is invalid for a return type of bool when NULL is defined
as `nullptr` instead of 0L
--- a/include/cecloader.h
+++ b/include/cecloader.h
@@ -172,7 +172,7 @@ bool LibCecBootloader(const char *strLib = NULL)
     if (!g_libCEC)
     {
       std::cout << dlerror() << std::endl;
-      return NULL;
+      return false;
     }
   }
 
@@ -181,7 +181,7 @@ bool LibCecBootloader(const char *strLib = NULL)
   if (!LibCecBootloader)
   {
     std::cout << "cannot find CECStartBootloader" << std::endl;
-    return NULL;
+    return false;
   }
 
   bool bReturn = LibCecBootloader();