apparmor: Use IS_ERR_OR_NULL() helper function

Use the IS_ERR_OR_NULL() helper instead of open-coding a
NULL and an error pointer checks to simplify the code and
improve readability.

Signed-off-by: Hongbo Li <lihongbo22@huawei.com>
Signed-off-by: John Johansen <john.johansen@canonical.com>

diff --git a/security/apparmor/path.c b/security/apparmor/path.c
index 45ec994..d6c74c3 100644 (file)
--- a/security/apparmor/path.c
+++ b/security/apparmor/path.c
@@ -130,7 +130,7 @@ static int d_namespace_path(const struct path *path, char *buf, char **name,
        /* handle error conditions - and still allow a partial path to
         * be returned.
         */
-       if (!res || IS_ERR(res)) {
+       if (IS_ERR_OR_NULL(res)) {
                if (PTR_ERR(res) == -ENAMETOOLONG) {
                        error = -ENAMETOOLONG;
                        *name = buf;