doing the NPE check fixes it. Unsure why `mmap` in the first place is null,
probably this method might have been called twice? Anyway, I don't think it
hurts to check for NPE in that case
```
[2018-09-03 00:16:04,902] INFO Updated PartitionLeaderEpoch. New: {epoch:0,
offset:0}, Current: {epoch:-1, offset:-1} for Partition: test4-0. Cache now
contains 0 entries. (kafka.server.epoch.LeaderEpochFileCache)
[2018-09-03 00:16:53,361] INFO Deleted log
C:\tmp\kafka-logs\test3-0.d2d44094e2a74667b84ae6d843835a57-delete\00000000000000000000.log.
(kafka.log.LogSegment)
[2018-09-03 00:16:53,361] INFO Deleted offset index
C:\tmp\kafka-logs\test3-0.d2d44094e2a74667b84ae6d843835a57-delete\00000000000000000000.index.
(kafka.log.LogSegment)
[2018-09-03 00:16:53,361] INFO Deleted time index
C:\tmp\kafka-logs\test3-0.d2d44094e2a74667b84ae6d843835a57-delete\00000000000000000000.timeindex.
(kafka.log.LogSegment)
[2018-09-03 00:16:53,375] INFO Deleted log for partition test3-0 in
C:\tmp\kafka-logs\test3-0.d2d44094e2a74667b84ae6d843835a57-delete.
(kafka.log.LogManager)
```
[ Full content available at: https://github.com/apache/kafka/pull/5603 ]
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