Unregister every registered application by MiniVM.

The MinivmMWI application was not being unregistered on unload and we were not
able to load again the module or reload it.

(closes issue #15174)
Reported by: junky
Patches:
      unregister_minivm_mwi.diff uploaded by junky (license 177)



git-svn-id: https://origsvn.digium.com/svn/asterisk/trunk@196377 65c4cc65-6c06-0410-ace0-fbb531ad65f3

apps/app_minivm.c

@@ -3462,6 +3462,8 @@ static int unload_module(void)
 	res |= ast_unregister_application(app_minivm_notify);
 	res |= ast_unregister_application(app_minivm_delete);
 	res |= ast_unregister_application(app_minivm_accmess);
+	res |= ast_unregister_application(app_minivm_mwi);
+
 	ast_cli_unregister_multiple(cli_minivm, ARRAY_LEN(cli_minivm));
 	ast_custom_function_unregister(&minivm_account_function);
 	ast_custom_function_unregister(&minivm_counter_function);