chg: 'script run mifare_autopwn' - when used with -k parameter, exit after one run.

client/scripts/mifare_autopwn.lua

@@ -180,6 +180,8 @@ local function main(args)
 				nested(key,sak)
 				-- Dump info
 				dump(uid)
+
+				if #key == 12 then exit = true end
 			else
 				print("Card found, darkside attack useless PRNG hardend on UID", uid)
 			end