watch: fix null fileName on windows systems
#43640
| Job | Run time |
|---|---|
| 1h 10m 18s | |
| 1h 50m 23s | |
| 3h 0m 41s |
fileName on windows systems
#43640
| Job | Run time |
|---|---|
| 1h 10m 18s | |
| 1h 50m 23s | |
| 3h 0m 41s |