SCP fails to locate remote file: '-- <filename>'

[mike.mackintosh at angrystatic.com]

I am not sure if many people have run into this, but recently working  
with some non-standard SSH capable devices, Routers, Firewalls and  
Switches, I noticed SCP failed on many of them. Looking through logs I  
saw:

SCP unable to find file: '-- config'

When looking through the verbose output from the issued command, it  
was passing:

scp -v -f -- config

I am not sure why the -- is needed in this command. I have attached a  
patch for scp.c to fix this functionality in the event anyone else  
runs into this.
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