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cgmanager: cgm_get: len = 0 is a query for length only
The caller might (like lxc-test-startone does) pass in a valid (or invalid) buffer and 0 length. Signed-off-by: Serge Hallyn <serge.hallyn@ubuntu.com> Acked-by: Stéphane Graber <stgraber@ubuntu.com>
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