JFS: Fix broken return code checking in ACL code

fs/jfs/xattr.c

@@ -668,12 +668,13 @@ static int can_set_system_xattr(struct inode *inode, const char *name,
 	 */
 	if (strcmp(name, XATTR_NAME_ACL_ACCESS) == 0) {
 		acl = posix_acl_from_xattr(value, value_len);
-		if (acl < 0) {
+		if (IS_ERR(acl)) {
+			rc = PTR_ERR(acl);
 			printk(KERN_ERR "posix_acl_from_xattr returned %d\n",
 			       rc);
 			return rc;
 		}
-		if (acl > 0) {
+		if (acl) {
 			mode_t mode = inode->i_mode;
 			rc = posix_acl_equiv_mode(acl, &mode);
 			posix_acl_release(acl);