testing: net/http/TestChunkReaderAllocs flaky

[alberts]

--- FAIL: TestChunkReaderAllocs-8 (0.00 seconds)
chunked_test.go:69: 17 mallocs; want <= 1

This is probably related to issue #5000.

[davecheney]

Comment 1:

Status changed to Duplicate.

Merged into issue #5608.