mainline inclusion
from mainline-4.20-rc5
commit 909e22e05353a783c526829427e9a8de122fba9c
category: bugfix
bugzilla: 5905
CVE: NA
---------------------------

Fix a static code checker warning:
  fs/exportfs/expfs.c:171 reconnect_one() warn: passing zero to 'ERR_PTR'

The error path for lookup_one_len_unlocked failure
should set err to PTR_ERR.

Fixes: bbf7a8a3 ("exportfs: move most of reconnect_path to helper function")
Signed-off-by: NYueHaibing <yuehaibing@huawei.com>
Signed-off-by: NAl Viro <viro@zeniv.linux.org.uk>
Signed-off-by: NYufen Yu <yuyufen@huawei.com>
Reviewed-by: NHou Tao <houtao1@huawei.com>
Signed-off-by: NYang Yingliang <yangyingliang@huawei.com>