fix(osx): consolidate error checks in alt_clock_gettime for clarity
#1334
| Job | Run time |
|---|---|
| 1s | |
| 3m 47s | |
| 2m 47s | |
| 2m 26s | |
| 4m 5s | |
| 3m 50s | |
| 8m 11s | |
| 3m 31s | |
| 40s | |
| 4m 21s | |
| 3m 55s | |
| 3m 46s | |
| 4m 39s | |
| 3m 24s | |
| 0s | |
| 2m 45s | |
| 3m 6s | |
| 55m 14s |