XArray: set the marks correctly when splitting an entry

If we created a new node to replace an entry which had search marks set,
we were setting the search mark on every entry in that node.  That works
fine when we're splitting to order 0, but when splitting to a larger
order, we must not set the search marks on the sibling entries.

Link: https://lkml.kernel.org/r/[email protected]
Fixes: c010d47f107f ("mm: thp: split huge page to any lower order pages")
Signed-off-by: Matthew Wilcox (Oracle) <[email protected]>
Reported-by: Luis Chamberlain <[email protected]>
Link: https://lore.kernel.org/r/[email protected]
Tested-by: Luis Chamberlain <[email protected]>
Cc: Zi Yan <[email protected]>
Signed-off-by: Andrew Morton <[email protected]>

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