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maple_tree: correct right ma_wr_state end pivot in mas_wr_spanning_store()

The end_piv will be needed in the next patch set and has not been set
correctly in this code path. Correct the oversight before using it.

Link: https://lkml.kernel.org/r/20260130205935.2559335-11-Liam.Howlett@oracle.com
Signed-off-by: Liam R. Howlett <Liam.Howlett@oracle.com>
Cc: Alice Ryhl <aliceryhl@google.com>
Cc: Andrew Ballance <andrewjballance@gmail.com>
Cc: Arnd Bergmann <arnd@arndb.de>
Cc: Christian Kujau <lists@nerdbynature.de>
Cc: Geert Uytterhoeven <geert@linux-m68k.org>
Cc: Kuninori Morimoto <kuninori.morimoto.gx@renesas.com>
Cc: Matthew Wilcox (Oracle) <willy@infradead.org>
Cc: SeongJae Park <sj@kernel.org>
Cc: Sidhartha Kumar <sidhartha.kumar@oracle.com>
Cc: Suren Baghdasaryan <surenb@google.com>
Cc: Vlastimil Babka <vbabka@suse.cz>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>

authored by

Liam R. Howlett and committed by
Andrew Morton 6b74d44b 2fce1c3c

+1
+1
lib/maple_tree.c
··· 3494 3494 r_mas.index = r_mas.last; 3495 3495 mas_wr_walk_index(&r_wr_mas); 3496 3496 r_mas.last = r_mas.index = mas->last; 3497 + r_wr_mas.end_piv = r_wr_mas.r_max; 3497 3498 3498 3499 /* Set up left side. */ 3499 3500 mas_wr_walk_index(wr_mas);