quic: remove redundant === 0n checks in kFinishClose method

Removed unreachable conditional checks in kFinishClose (lib/internal/quic/quic.js:1386–1401) that were redundant due to an early return, reducing code complexity.

Author: rishabnotfound

lib/internal/quic/quic.js

@@ -352,7 +352,7 @@ const onSessionHandshakeChannel = dc.channel('quic.session.handshake');
  * @property {bigint|number} [maxConnectionsTotal] The maximum number of total connections
  * @property {bigint|number} [maxStatelessResetsPerHost] The maximum number of stateless resets per host
  * @property {bigint|number} [addressLRUSize] The size of the address LRU cache
- * @property {bigint|number} [maxRetries] The maximum number of retriesw
+ * @property {bigint|number} [maxRetries] The maximum number of retries
  * @property {number} [rxDiagnosticLoss] The receive diagnostic loss probability (range 0.0-1.0)
  * @property {number} [txDiagnosticLoss] The transmit diagnostic loss probability (range 0.0-1.0)
  * @property {number} [udpReceiveBufferSize] The UDP receive buffer size
@@ -507,7 +507,7 @@ setCallbacks({
     if (session.destroyed) {
       stream.destroy();
       return;
-    };
+    }
     session[kNewStream](stream, direction);
   },
 
@@ -1383,29 +1383,21 @@ class QuicSession {
     debug('finishing closing the session with an error', errorType, code, reason);
     // Otherwise, errorType indicates the type of error that occurred, code indicates
     // the specific error, and reason is an optional string describing the error.
+    // Note: code is guaranteed to be non-zero here due to early return above
     switch (errorType) {
       case 0: /* Transport Error */
-        if (code === 0n) {
-          this.destroy();
-        } else {
-          this.destroy(new ERR_QUIC_TRANSPORT_ERROR(code, reason));
-        }
+        this.destroy(new ERR_QUIC_TRANSPORT_ERROR(code, reason));
         break;
       case 1: /* Application Error */
-        if (code === 0n) {
-          this.destroy();
-        } else {
-          this.destroy(new ERR_QUIC_APPLICATION_ERROR(code, reason));
-        }
+        this.destroy(new ERR_QUIC_APPLICATION_ERROR(code, reason));
         break;
       case 2: /* Version Negotiation Error */
         this.destroy(new ERR_QUIC_VERSION_NEGOTIATION_ERROR());
         break;
-      case 3: /* Idle close */ {
+      case 3: /* Idle close */
         // An idle close is not really an error. We can just destroy.
         this.destroy();
         break;
-      }
     }
   }