xenconfig: xm: check for driver on disk format
When reviewing libxl vif typename series[0] I found a bug on xen-xm formatter where "virsh domxml-to-native xen-xm file.xml" can lead to a NULL dereference if the disk driver isn't specified. Fix this by checking for driver before writing/testing it down. [0] https://www.redhat.com/archives/libvir-list/2016-April/msg01434.htmlSigned-off-by: NJoao Martins <joao.m.martins@oracle.com>
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