The loader for xen paravirtualized environment isn't callable multiple
times as it won't free any memory in case of failure.
Call grub_relocator_unload() as other modules do it before allocating
a new relocator or when unloading the module.
Signed-off-by: Juergen Gross <jgross@suse.com>
Reviewed-by: Daniel Kiper <daniel.kiper@oracle.com>