Should stop when output pipe is closed

[glandium]

I was doing something like:

$ ssh host cat verylargearchive.zst | zstd -d | rg pattern | head

to check that my pattern made sense before running on the full thing. And that hang for a while, and I assume it would have waited for the whole thing to have been read.

Replace rg with grep and the program stops as soon as head closes its input pipe.

[BurntSushi]

Yes, this is a known bug. Dupe of #200.