[FS#3789] odhcpd: ra_mtu default value '0' causes error on config_parse_interface

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FS#3789 - odhcpd: ra_mtu default value '0' causes error on config_parse_interface
User who did this - Hans Dedecker (dedeckeh)

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I fail to understand the issue as the code in config.c is only hit when a ra_mtu value is specified in the dhcp interface uci section; but this is not by default the case as the default config does not have a ra_mtu value (https://github.com/openwrt/openwrt/blob/master/package/network/services/odhcpd/files/odhcpd.defaults)
One could indeed argue if an invalid ra_mtu is specified if this should be considered as a fatal error; maybe a better approach is just ignore it and write to syslog

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https://bugs.openwrt.org/index.php?do=details&task_id=3789#comment9627

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