xen/xen_initial_domain: check that xen_start_info is initialized
Since commit commit 4c071ee5 ("arm: initial Xen support") PV on HVM guests can be xen_initial_domain. However PV on HVM guests might have an unitialized xen_start_info, so check before accessing its fields. Signed-off-by: NStefano Stabellini <stefano.stabellini@eu.citrix.com> Acked-by: NIan Campbell <Ian.Campbell@citrix.com> Reported-by: NKonrad Rzeszutek Wilk <konrad.wilk@oracle.com> Signed-off-by: NKonrad Rzeszutek Wilk <konrad.wilk@oracle.com>
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