check for CONFIG_STATUS_FILE_INVALID when loading the res_fax config file

Patch by: tzafrir
Reported by: tzafrir
(closes issue ASTERISK-18161)


git-svn-id: https://origsvn.digium.com/svn/asterisk/branches/1.8@329991 65c4cc65-6c06-0410-ace0-fbb531ad65f3

res/res_fax.c

@@ -2613,6 +2613,12 @@ static int set_config(const char *config_file)
 		ast_log(LOG_NOTICE, "Configuration file '%s' not found, using default options.\n", config_file);
 		return 0;
 	}
+
+	if (cfg == CONFIG_STATUS_FILEINVALID) {
+		ast_log(LOG_NOTICE, "Configuration file '%s' is invalid, using default options.\n", config_file);
+		return 0;
+	}
+
 	if (cfg == CONFIG_STATUS_FILEUNCHANGED) {
 		ast_clear_flag(&config_flags, CONFIG_FLAG_FILEUNCHANGED);
 		cfg = ast_config_load2(config_file, "res_fax", config_flags);