net: Return the correct errno code

stable inclusion
from linux-4.19.196
commit b966a0defc93c533c0f96410c20f50c42a5fed52

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

[ Upstream commit 49251cd0 ]

When kalloc or kmemdup failed, should return ENOMEM rather than ENOBUF.

Signed-off-by: Zheng Yongjun <zhengyongjun3@huawei.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Signed-off-by: Sasha Levin <sashal@kernel.org>
Signed-off-by: Yang Yingliang <yangyingliang@huawei.com>