fs: Fix error checking for d_hash_and_lookup()

stable inclusion
from stable-v4.19.295
commit 3b2531ba780099c8cfde73d2b426ae52e6afbff1
category: bugfix
bugzilla: https://gitee.com/openeuler/kernel/issues/I8EK5K


CVE: NA

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

[ Upstream commit 0d5a4f8f ]

The d_hash_and_lookup() function returns error pointers or NULL.
Most incorrect error checks were fixed, but the one in int path_pts()
was forgotten.

Fixes: eedf265a ("devpts: Make each mount of devpts an independent filesystem.")
Signed-off-by: Wang Ming <machel@vivo.com>
Message-Id: <20230713120555.7025-1-machel@vivo.com>
Signed-off-by: Christian Brauner <brauner@kernel.org>
Signed-off-by: Sasha Levin <sashal@kernel.org>
Signed-off-by: Yongqiang Liu <liuyongqiang13@huawei.com>