sysfs: fix simple_return.cocci warnings

security/smack/smackfs.c:2251:1-4: WARNING: end returns can be
simpified and declaration on line 2250 can be dropped

 Simplify a trivial if-return sequence.  Possibly combine with a
 preceding function call.

Generated by: scripts/coccinelle/misc/simple_return.cocci
Signed-off-by: NFengguang Wu <fengguang.wu@intel.com>
Acked-by: NSerge Hallyn <serge.hallyn@canonical.com>
Acked-by: NCasey Schaufler <casey@schaufler-ca.com>

security/smack/smackfs.c

@@ -2320,11 +2320,7 @@ static const struct file_operations smk_revoke_subj_ops = {
  */
 static int smk_init_sysfs(void)
 {
-	int err;
-	err = sysfs_create_mount_point(fs_kobj, "smackfs");
-	if (err)
-		return err;
-	return 0;
+	return sysfs_create_mount_point(fs_kobj, "smackfs");
 }
 
 /**