[PATCH] Linux: Add missing handling of tai field to __ntp_gettime64

[Florian Weimer]

* Joseph Myers:

> On Wed, 20 May 2020, Florian Weimer via Libc-alpha wrote:
>
>> This fixes a build error:
>> 
>> ../sysdeps/unix/sysv/linux/ntp_gettime.c: In function ‘__ntp_gettime’:
>> ../sysdeps/unix/sysv/linux/ntp_gettime.c:56:10: error: ‘ntv64.tai’ is used uninitialized in this function [-Werror=uninitialized]
>>    56 |   *ntv = valid_ntptimeval64_to_ntptimeval (ntv64);
>>       |          ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
>> 
>> ---
>> Testing on x86_64-linux-gnu, i686-linux-gnu and building with
>> build-many-glibcs.py is under way.
>
> OK.

Thanks, pushed after successful testing.

Florian