Piotr Tabor 099fd65821 Fix coverage test failure: e2e TestIssue6361.
Tested with:
```
(cd tests && COVERDIR='../../c' 'env' 'go' 'test' '-tags=cov' '-timeout' '30m' 'go.etcd.io/etcd/tests/v3/e2e' -run TestIssue6361 -v 2>&1 | tee log.log)
```
2021-05-16 10:58:41 +02:00
..