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This fixes the clobbering of the entry->next pointer when
unmapping the first entry in a bucket of a mapcache.
Fixes: 123acd816d ("xen: mapcache: Unmap first entries in buckets")
Reported-by: Anthony PERARD <anthony.perard@vates.tech>
Signed-off-by: Edgar E. Iglesias <edgar.iglesias@amd.com>
Reviewed-by: Anthony PERARD <anthony.perard@vates.tech>
Reviewed-by: Stefano Stabellini <sstabellini@kernel.org>