[PATCH] Initialize the entire obstack struct [BZ #17919]

[Siddhesh Poyarekar]

On Tue, Feb 03, 2015 at 08:08:54AM -0800, Paul Eggert wrote:
> Does this patch fix any actual bug?  If so, what's the bug?  Is there a
> faster way to fix it, other than zeroing out the entire struct obstack?

It fixes a valgrind warning on s390x, but if by bug you mean a user
visible problem, then no, there is no such thing.  I can't think of a
faster way that is not uglier, which is why I took the simpler, more
readable approach.

Siddhesh
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