Don't clobber 'ret' variable in testCompareXMLToXMLHelper
Don't clobber 'ret' variable in testCompareXMLToXMLHelper

The qemuxml2xmltest.c function testCompareXMLToXMLHelper would
clobber the 'ret' variable causing it to mis-diagnose OOM
errors.

Signed-off-by: Daniel P. Berrange <bb938cf255e055ff3507f2627d214e8e62118fcf@redhat.com>

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