Linux: Add missing handling of tai field to __ntp_gettime64
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); | ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
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