xenapi: Resolve Coverity NULL_RETURNS
Coverity points out that the return from virDomainDefParseString is not checked in xenapiDomainCreateXML like it should be which could end up in a NULL pointer dereference
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Coverity points out that the return from virDomainDefParseString is not checked in xenapiDomainCreateXML like it should be which could end up in a NULL pointer dereference