bpf, sockmap: Fix map type error in sock_map_del_link

mainline inclusion
from mainline-v6.5-rc6
commit 7e96ec0e
category: bugfix
bugzilla: https://gitee.com/openeuler/kernel/issues/I7DNAP
CVE: NA

Reference: https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=7e96ec0e6605b69bb21bbf6c0ff9051e656ec2b1



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sock_map_del_link() operates on both SOCKMAP and SOCKHASH, although
both types have member named "progs", the offset of "progs" member in
these two types is different, so "progs" should be accessed with the
real map type.

Fixes: 604326b4 ("bpf, sockmap: convert to generic sk_msg interface")
Signed-off-by: Xu Kuohai <xukuohai@huawei.com>
Reviewed-by: John Fastabend <john.fastabend@gmail.com>
Link: https://lore.kernel.org/r/20230804073740.194770-2-xukuohai@huaweicloud.com


Signed-off-by: Martin KaFai Lau <martin.lau@kernel.org>
Signed-off-by: Liu Jian <liujian56@huawei.com>

Conflicts:
	net/core/sock_map.c