With lock statement silently accept perceived inconsistent lock states for nolock cyobjects

Cython/Compiler/Nodes.py

@@ -8221,6 +8221,7 @@ class LockCypclassNode(StatNode):
         is_rlocked = self.obj.is_rhs_locked(env)
         is_wlocked = self.obj.is_lhs_locked(env)
 
+        if self.obj.type.lock_mode != "nolock":
             if self.state == "unclocked" and not (is_rlocked or is_wlocked):
                 error(self.pos, "Cannot unlock an already unlocked object !")