RTEMS | kern_ntptime.c: Assigning time_t to 32-bit variable truncates time (#5111)

[Joel Sherrill (@joel)]

Joel Sherrill created an issue: https://gitlab.rtems.org/rtems/rtos/rtems/-/issues/5111

Assignee: Joel Sherrill

## Summary

Coverity CID 1512505

Line 983 assigns the tv_sec (time_t) value to pps_lastsec (long). long is 32-bits on RTEMS 32-bit targets and time_t is always 64-bits. The solution should be to use time_t for pps_lastsec.

```
981        pps_calcnt++;
 982        v_nsec = -pps_fcount;
      	
CID 1512505: (#2 of 2): Use of 32-bit time_t (Y2K38_SAFETY)
1. store_truncates_time_t: A time_t value is stored in an integer with too few bits to accommodate it. The expression pps_tf[0].tv_sec is cast to long.
 983        pps_lastsec = pps_tf[0].tv_sec;
```

-- 
View it on GitLab: https://gitlab.rtems.org/rtems/rtos/rtems/-/issues/5111
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