exportfs: fix 'passing zero to ERR_PTR()' warning

[ Upstream commit 909e22e05353a783c526829427e9a8de122fba9c ]

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: bbf7a8a3562f ("exportfs: move most of reconnect_path to helper function")
Signed-off-by: YueHaibing <yuehaibing@huawei.com>
Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
Signed-off-by: Sasha Levin <sashal@kernel.org>
diff --git a/fs/exportfs/expfs.c b/fs/exportfs/expfs.c
index 3706939..1730122 100644
--- a/fs/exportfs/expfs.c
+++ b/fs/exportfs/expfs.c
@@ -146,6 +146,7 @@
 	tmp = lookup_one_len_unlocked(nbuf, parent, strlen(nbuf));
 	if (IS_ERR(tmp)) {
 		dprintk("%s: lookup failed: %d\n", __func__, PTR_ERR(tmp));
+		err = PTR_ERR(tmp);
 		goto out_err;
 	}
 	if (tmp != dentry) {