[PATCH] Fix libdnet compiler warnings

Compiling Nmap 4.20 with GCC 4.1.1 on my Linux box produces the following 4
warnings in the libdnet code:

addr-util.c: In function 'ip6_ntop':
addr-util.c:177: warning: 'cur.len' may be used uninitialized in this
function addr-util.c:177: warning: 'best.len' may be used uninitialized in
this function intf.c: In function 'intf_get_dst':
intf.c:626: warning: pointer targets in passing argument 3 of 'getsockname'
differ in signedness ip.c: In function 'ip_open':
ip.c:43: warning: pointer targets in passing argument 5 of 'getsockopt'
differ in signedness

I know it's rather nit-picky but I've attached a patch anyways.

Brandon

-- 
Brandon Enright
Network Security Analyst
UCSD ACS/Network Operations
bmenrigh_at_ucsd.edu

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