RFR: JDK-8239139 testmake fail with warning about strncpy using gcc version 8(Internet mail)

[linzang(臧琳)]

Thanks Alan. 

Hi all, 
    May I get more review about this tiny patch? Thanks!

--------------
Lin
>On 17/02/2020 10:37, linzang(臧琳) wrote:
>> From updates in https://bugs.openjdk.java.net/browse/JDK-8239139,
>> This is related to a test case of recent nio patch.
>> so move this thread to nio-dev.
>>
>Yes, this test was expanded recently to run the launcher with stdin
>connected to a Unix domain socket. The len parameter should have been
>sizeof(addr.sun_path) but changing this to snprintf looks okay too.
>
>-Alan.
>