[FS#1430] MAP rule parsing incorrectly handles additional FMR rules

[LEDE Bugs]

The following task has a new comment added:

FS#1430 - MAP rule parsing incorrectly handles additional FMR rules
User who did this - Det (detobate)

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DHCPv6 Option 95 used: 0059001600081c027ffe00302a020c7afe40005d000406000000005b0009402a020c7afdff00000059001801001c5adfbec0402a020c7a8000fe07005d000400000000

This includes the DMR, the BMR (with FMR bit enabled), and an additional distinct FMR rule.
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More information can be found at the following URL:
https://bugs.openwrt.org/index.php?do=details&task_id=1430#comment4505