regress: Support NULL fdset arguments to select
authorIan Jackson <ijackson@chiark.greenend.org.uk>
Wed, 28 Jan 2015 23:49:19 +0000 (23:49 +0000)
committerIan Jackson <ijackson@chiark.greenend.org.uk>
Thu, 29 Jan 2015 00:24:24 +0000 (00:24 +0000)
We are going to want to pass these, and currently the test harness
will dereference the NULL.  So fix this.

Signed-off-by: Ian Jackson <ijackson@chiark.greenend.org.uk>

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