af_unix: Pass struct sock to unix_autobind().

mainline inclusion
from mainline-v5.17-rc1
commit f7ed31f4
category: feature
bugzilla: https://gitee.com/openeuler/kernel/issues/I4OM1C
CVE: NA

Reference: https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=f7ed31f4615f4e1d97c0e4325c5b8a240e10073c



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

We do not use struct socket in unix_autobind() and pass struct sock to
unix_bind_bsd() and unix_bind_abstract().  Let's pass it to unix_autobind()
as well.

Also, this patch fixes these errors by checkpatch.pl.

  ERROR: do not use assignment in if condition
  #1795: FILE: net/unix/af_unix.c:1795:
  +	if (test_bit(SOCK_PASSCRED, &sock->flags) && !u->addr

  CHECK: Logical continuations should be on the previous line
  #1796: FILE: net/unix/af_unix.c:1796:
  +	if (test_bit(SOCK_PASSCRED, &sock->flags) && !u->addr
  +	    && (err = unix_autobind(sock)) != 0)

Signed-off-by: Kuniyuki Iwashima <kuniyu@amazon.co.jp>
Signed-off-by: Jakub Kicinski <kuba@kernel.org>
Signed-off-by: Baisong Zhong <zhongbaisong@huawei.com>
Reviewed-by: Yue Haibing <yuehaibing@huawei.com>
Reviewed-by: Wei Yongjun <weiyongjun1@huawei.com>
Signed-off-by: Zheng Zengkai <zhengzengkai@huawei.com>