xen/pci: Allocate memory for physdev_pci_device_add's optarr
physdev_pci_device_add's optarr[] is a zero-sized array and therefore reference to add.optarr[0] is accessing memory that does not belong to the 'add' variable. Signed-off-by: Boris Ostrovsky <boris.ostrovsky@oracle.com> Reviewed-by: Jan Beulich <jbeulich@suse.com> Signed-off-by: David Vrabel <david.vrabel@citrix.com>
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