[FS#248] Firewall configuration: multiple negative masq_dest options do not work

[LEDE Bugs]

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FS#248 - Firewall configuration: multiple negative masq_dest options do not work
User who did this: Jo-Philipp Wich (jow-)
Status: Assigned -> Requires testing

More information can be found at the following URL:
https://bugs.lede-project.org/index.php?do=details&task_id=248