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[ Upstream commitcbe83191d4] Since commitff9fb72bc0("debugfs: return error values, not NULL") changed return value of debugfs_rename() in error cases from %NULL to %ERR_PTR(-ERROR), we should also check error values instead of NULL. Fixes:ff9fb72bc0("debugfs: return error values, not NULL") Signed-off-by: Qi Zheng <zhengqi.arch@bytedance.com> Acked-by: Jay Vosburgh <jay.vosburgh@canonical.com> Link: https://lore.kernel.org/r/20230202093256.32458-1-zhengqi.arch@bytedance.com Signed-off-by: Jakub Kicinski <kuba@kernel.org> Signed-off-by: Sasha Levin <sashal@kernel.org>