InternalsHandler: Clean up NACK iterator

Author: sillyverser

src/jvmMain/kotlin/org/golem/raknet/connection/InternalsHandler.kt

@@ -191,12 +191,8 @@ class InternalsHandler(
         // Queue up any packets that need to be resent
         nAcknowledge.records.forEach { record ->
             record.asList().forEach { index ->
-                val frame = resendQueue[index]
-                if(frame != null) {
-                    sendQueue.add(frame)
-                } else {
-                    throw IllegalStateException("Frame not found in resend queue")
-                }
+                val frame = resendQueue[index] ?: throw IllegalStateException("Frame not found in resend queue")
+                sendQueue.add(frame)
             }
         }
     }