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Fix for elf_getdata/elf_flagdata on empty section

From: Petr Machata <pmachata at redhat dot com>
To: elfutils-devel at lists dot fedorahosted dot org
Date: Thu, 01 Apr 2010 20:21:43 +0200
Subject: Fix for elf_getdata/elf_flagdata on empty section

... sits on the branch "pmachata/576283", commits b6b942 and 3fdd54
(testcase and fix).

The problem appears ta be that the backlink from data to section,
data.s, is not initialized for bitless sections (NODATA or zero size).
The link should be initialized in convert_data, but that's not called
for these sections.

Please review.

PM

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