tests: Fix logic to not have possible NULL deref
It's possible that virBitmapNewString returns NULL with an error string (and not an allocation failure that would abort); however, if virBitmapToString is called with a NULL @bitmap, then it will fail in an ugly manner. So rather than have if (!map && !str) logic, split the checks for each variable. Found by Coverity Signed-off-by: NJohn Ferlan <jferlan@redhat.com> Reviewed-by: NDaniel P. Berrangé <berrange@redhat.com>
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