ng_fec(4) crashes 6.0-BETA1

[Evgueni V. Gavrilov]

# ngctl -f - list
There are 3 total nodes:
  Name: ngctl97069      Type: socket          ID: 00000004   Num hooks: 0
  Name: em1             Type: ether           ID: 00000002   Num hooks: 0
  Name: em0             Type: ether           ID: 00000001   Num hooks: 0

# ngctl -f - mkpeer fec dummy fec
kernel: ng_ether_attach: can't name node fec0

# ngctl -f - list
There are 5 total nodes:
  Name: ngctl98385      Type: socket          ID: 00000008   Num hooks: 0
  Name: <unnamed>       Type: ether           ID: 00000007   Num hooks: 0
  Name: fec0            Type: fec             ID: 00000006   Num hooks: 0
  Name: em1             Type: ether           ID: 00000002   Num hooks: 0
  Name: em0             Type: ether           ID: 00000001   Num hooks: 0

adding em0 && em1 and bringing fec0 up (ifconfig fec0 inet 1.2.3.4 netmask 0xffffff00) causes panic (without crash dump)

Kernel config && dmesg available at http://aquatique.rusunix.org/ng_fec/

ng_fec(4) worked fine under 5.4-RELEASE and was the only Layer3 (link|port) (aggregation|trunk|failover)

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