res_pjsip_refer: Prevent unload except during shutdown.

Prevent unload of the module as certain pjsip initialization functions
cannot be reversed.

ASTERISK-24483

Change-Id: I94597ec8b8491f5af9c57bf66dbc3b078fe2d49d

diff --git a/res/res_pjsip_refer.c b/res/res_pjsip_refer.c
index 456e09dd812e3f93604f1fac18cc7d00f375a811..62f8b67de3ac6164f8c8fced57190e793b45affb 100644 (file)
--- a/res/res_pjsip_refer.c
+++ b/res/res_pjsip_refer.c
@@ -1211,6 +1211,8 @@ static int load_module(void)
        ast_sip_register_service(&refer_progress_module);
        ast_sip_session_register_supplement(&refer_supplement);
 
+       ast_module_shutdown_ref(ast_module_info->self);
+
        return AST_MODULE_LOAD_SUCCESS;
 }