posix: fix inet_ntop binding, clean up some style issues
posix: fix inet_ntop binding, clean up some style issues

Fixes bug 678988.

flobrosch/vala-fixes,rvu95/vala,severinh/vala,spidermonkdust/vala,Distrotech/vala,frida/vala,rvu95/vala,frida/vala,playya/vala,GNOME/vala,GNOME/vala,severinh/vala,rvu95/vala,flobrosch/vala-fixes,GNOME/vala,Distrotech/vala,Distrotech/vala,jessevdk/vala,severinh/vala,xdave/pvala,spidermonkdust/vala,jessevdk/vala,jessevdk/vala,playya/vala,frida/vala,GNOME/vala,spidermonkdust/vala,frida/vala,frida/vala,playya/vala,flobrosch/vala-fixes