3784901fce
This used to hang at 100% CPU:
cat /dev/zero | gocryptfs -init a
...and would ultimately send the box into out-of-memory.
The number 1000 is chosen arbitrarily and seems big enough
given that the password must be one line.
Suggested by @mhogomchungu in https://github.com/rfjakob/gocryptfs/issues/77 .