feature: add devpts fd wrapper (#21)

This feature is intended to resolve devpts problem.

kernel/sucompat.c

@@ -408,8 +408,8 @@ int __ksu_handle_devpts(struct inode *inode)
         struct inode_security_struct *sec =
             (struct inode_security_struct *)inode->i_security;
 #endif
-    if (ksu_devpts_sid && sec)
-        sec->sid = ksu_devpts_sid;
+    if (ksu_file_sid && sec)
+        sec->sid = ksu_file_sid;
 
     return 0;
 }