dm persistent data: remove unused return from exit_shadow_spine()
Fix the following coccicheck warnings: ./drivers/md/persistent-data/dm-btree-spine.c:188:5-6: Unneeded variable: "r". Return "0" on line 194. Reported-by: Abaci Robot <abaci@linux.alibaba.com> Signed-off-by: Jiapeng Chong <jiapeng.chong@linux.alibaba.com> Signed-off-by: Mike Snitzer <snitzer@redhat.com>
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