fix: 修复闭包参数混用导致的编译错误

Sources/Nats/NatsConnection.swift

@@ -937,7 +937,6 @@ class ConnectionHandler: ChannelInboundHandler {
             if currentState == .disconnected || currentState == .closed {
                 return false  // Already in disconnected/closed state
             }
-            $0 = .disconnected
             return true
         }
         
@@ -945,6 +944,9 @@ class ConnectionHandler: ChannelInboundHandler {
             return
         }
         
+        // Set state to disconnected after check
+        state.withLockedValue { $0 = .disconnected }
+        
         // Clean up pending continuations to prevent leaks
         if let continuation = serverInfoContinuation.withLockedValue({ cont in
             let toResume = cont