[Patch] [Makefile] Exit if provided an incorrect argument

[Florian Weimer]

* Matthew Malcomson:

> On 15/01/19 10:03, Florian Weimer wrote:
>> * Matthew Malcomson:
>>
>>> --- a/Makefile
>>> +++ b/Makefile
>>> @@ -148,6 +148,7 @@ while test $$# -gt 0 ; do
>>>         ;;
>>>       --*)
>>>         usage
>>> +      exit 1
>>>         ;;
>>>       *)
>>>         break
>> I think you should add the exit to the usage function.
>>
>> Thanks,
>> Florian
>
> Makes sense -- thanks!
> Fixed patch attached.

Thanks, pushed.

Florian