hulk inclusion
category: bugfix
bugzilla: https://gitee.com/openeuler/kernel/issues/I6OSXU

----------------------------------------

commit "md/raid6: refactor raid5_read_one_chunk" incorrectly merged the
code.
Repeatedly applying for memory leads to memory leaks.

Fix it by removing redundant allocating memory code.

Fixes: c13c2cd2 ("md/raid6: refactor raid5_read_one_chunk")
Signed-off-by: NZhong Jinghua <zhongjinghua@huawei.com>
Reviewed-by: NHou Tao <houtao1@huawei.com>
Signed-off-by: NJialin Zhang <zhangjialin11@huawei.com>