[PATCH] split: return success even if a --filter exits

[Pádraig Brady]

I notice that split --filter spuriously returned with
status 141 just because the filter finished early.
This is a fairly good way to reproduce:

yes | head -n200K | split -b1G --filter='head -c1 >/dev/null'

I avoided this by not unblocking SIGPIPEs before
calling closeout(), which just lets any pending SIGPIPEs through.
I can't see why we would need to unblock them.

cheers,
Pádraig.

split-filter-status.diff
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