[patch] fix wlan-udev.sh

[richard]

Hi Solomon,

Here's a fixed version of the wlan-udev.sh script -- I really think I
might have got it right this time :)

wlan_bring_it_up always returns 1 when passed the extra wlan_wext_write
parameter, so this version doesn't bother to check the return value and
also returns 0 to tell udevd that we were successful.

Cheers
Richard