[Patch] fwcontrol.c: iterate over multiple firewire boards if available

[Sean Bruno]

-- Iterate over mulitple f/w boards if there are no arguments passed.

Provides the following output for multiple boards:
[sean at home-test ~/RELENG_7/src/usr.sbin/fwcontrol]$ sudo ./fwcontrol
1 devices (info_len=1)
node           EUI64          status    hostname
   0  00-13-3b-01-00-01-01-82      0   
1 devices (info_len=1)
node           EUI64          status    hostname
   0  00-11-06-00-00-00-4a-bb      0   


Sean
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