tail: fix behaviour of tail -n0 in follow mode
#4072
| Job | Run time |
|---|---|
| 3m 30s | |
| 1m 14s | |
| 1m 17s | |
| 1m 21s | |
| 2m 55s | |
| 3m 20s | |
| 8m 9s | |
| 2m 15s | |
| 2m 35s | |
| 13m 11s | |
| 1m 17s | |
| 6m 29s | |
| 3m 22s | |
| 2m 32s | |
| 2m 0s | |
| 2m 32s | |
| 5m 42s | |
| 3m 4s | |
| 1m 42s | |
| 1m 15s | |
| 2m 10s | |
| 1m 40s | |
| 1h 13m 32s |