netlink: remove hash::nelems check in netlink_insert

stable inclusion
from stable-v4.19.272
commit bc6199018f7b1b1fca9d6d3a746101d72859c332
category: bugfix
bugzilla: https://gitee.com/openeuler/kernel/issues/I6KOHU


CVE: NA

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

[ Upstream commit 0041195d ]

The type of hash::nelems has been changed from size_t to atom_t
which in fact is int, so not need to check if BITS_PER_LONG, that
is bit number of size_t, is bigger than 32

and rht_grow_above_max() will be called to check if hashtable is
too big, ensure it can not bigger than 1<<31

Signed-off-by: Zhang Yu <zhangyu31@baidu.com>
Signed-off-by: Li RongQing <lirongqing@baidu.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Stable-dep-of: c1bb9484 ("netlink: annotate data races around nlk->portid")
Signed-off-by: Sasha Levin <sashal@kernel.org>
Signed-off-by: Yongqiang Liu <liuyongqiang13@huawei.com>