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dwarf_haschildren: Return -1 for error case, not 0.

From: Roland McGrath <roland at redhat dot com>
To: elfutils-devel at lists dot fedorahosted dot org
Date: Sat, 10 Jan 2009 00:41:30 -0800
Subject: dwarf_haschildren: Return -1 for error case, not 0.

Please review the roland/fixes-for-c++ branch, which (aside from merges)
just has commit 1f6d2010bb26b6bf5395a98651fce9a1a9141ac3 (Subject:).
The C++ wrapper throws an exception for error, and without this it
couldn't tell for dwarf_haschildren without doing something unclean.

Ok to merge?


Thanks,
Roland

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