devlink: Fix incorrect skb socket family dumping

devlink: Fix incorrect skb socket family dumping

The devlink_fmsg_dump_skb function was incorrectly using the socket
type (sk->sk_type) instead of the socket family (sk->sk_family)
when filling the "family" field in the fast message dump.

This patch fixes this to properly display the socket family.

Fixes: 3dbfde7f6bc7b8 ("devlink: add devlink_fmsg_dump_skb() function")
Signed-off-by: Li RongQing <lirongqing@baidu.com>
Link: https://patch.msgid.link/20260407022730.2393-1-lirongqing@baidu.com
Signed-off-by: Jakub Kicinski <kuba@kernel.org>