fix "direction" argument of iov_iter_kvec()

stable inclusion
from stable-v5.10.168
commit 63d1c4edbfc1e93f40170bbee7965ca55973cd12
category: bugfix
bugzilla: https://gitee.com/openeuler/kernel/issues/I7URR4

Reference: https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git/commit/?id=63d1c4edbfc1e93f40170bbee7965ca55973cd12



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[ Upstream commit fc02f337 ]

Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
Signed-off-by: Sasha Levin <sashal@kernel.org>
Signed-off-by: zhaoxiaoqiang11 <zhaoxiaoqiang11@jd.com>