Don't clobber 'ret' in LXC XML test case
Don't clobber 'ret' in LXC XML test case

The testCompareXMLToXMLHelper method clobbered the 'ret' variable
in several places leading to a failure to report OOM errors from
the test suite.

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

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