-P0 still attempts ARP scan

[William MacKay <foobaz () gmail com>]

I have looked through the source, but i can't figure out why Nmap is  
doing an ARP ping scan when i give it -P0. Is this a bug? I'm pasting  
a log to demonstrate the problem. The -p80 option isn't necessary,  
but makes the log a lot shorter:

11:41 foobaz@port200:~]% sudo nmap -v -P0 -p80 10.171.32.1

Starting nmap 3.93 ( http://www.insecure.org/nmap/ ) at 2005-09-13  
11:42 EDT
Initiating ARP Ping Scan against 10.171.32.1 [1 port] at 11:42
The ARP Ping Scan took 0.01s to scan 1 total hosts.
Initiating SYN Stealth Scan against 10.171.32.1 [1 port] at 11:42
The SYN Stealth Scan took 0.22s to scan 1 total ports.
Host 10.171.32.1 appears to be up ... good.
Interesting ports on 10.171.32.1:
PORT   STATE    SERVICE
80/tcp filtered http
MAC Address: 00:08:7C:EA:0C:80 (Cisco Systems)

Nmap finished: 1 IP address (1 host up) scanned in 0.656 seconds
                Raw packets sent: 3 (122B) | Rcvd: 1 (42B)
11:42 foobaz@port200:~]%


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