ffs-set-segment: Fix some typos in util.lua

ffs-set-segment/luasrc/usr/lib/lua/ffs-set-segment/util.lua

@@ -34,9 +34,9 @@ end
 function M.lock(lockfilename)
 	local lockfd, err = fcntl.open(lockfilename, bit.bor(fcntl.O_WRONLY, fcntl.O_CREAT), 384) -- mode 0600
 	if not lockfd then
-		autil.log('err', err)
+		M.log('err', err)
 		local err_verbose = string.format("Unable to get file descriptor for lock file %s .", lockfilename)
-		autil.log('err', err_verbose)
+		M.log('err', err_verbose)
 		os.exit(1)
 	end
 
@@ -148,7 +148,7 @@ function M.get_segment_from_dns(nodeid, pubkey)
 end
 
 function M.get_segment_from_batman()
-	local gwl = json.parse(execute("batctl meshif bat0 gateways_json", "r"))
+	local gwl = json.parse(execute("batctl meshif bat0 gateways_json"))
 	if not gwl then
 		return nil
 	end