[Bug 253209] grep -v -f some-empty-file -- does the wrong thing

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=253209

--- Comment #1 from Kyle Evans <kevans at freebsd.org> ---
Created attachment 222170
  --> https://bugs.freebsd.org/bugzilla/attachment.cgi?id=222170&action=edit
git(1) diff against base

Looks like this dates back to the 2011 update, though I certainly didn't help
matters any... basically, we short-circuit back in main() far before we get to
any matching stuff, but we cannot short-circuit because we may still need to
output.

The attached patch fixes the semantics of -w and -x in the presence of both
null patterns and empty pattern files, to make sure that we don't miss
anything. I will commit it ~tonight, most likely.

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