AMD/IOMMU: Fix crash in 'V' debugkey

AMD/IOMMU: Fix crash in 'V' debugkey

c/s bb038f31168 "AMD/IOMMU: replace INTREMAP_ENTRIES" introduces a call to
intremap_table_entries() in dump_intremap_table() before tbl.ptr is checked
for NULL.

intremap_table_entries() internally uses virt_to_page() which falls over

  ASSERT(va >= XEN_VIRT_START);

in __virt_to_page().

Reported-by: Igor Druzhinin <igor.druzhinin@citrix.com>
Signed-off-by: Andrew Cooper <andrew.cooper3@citrix.com>
Reviewed-by: Jan Beulich <jbeulich@suse.com>
Release-acked-by: Juergen Gross <jgross@suse.com>