Release timeout memory for scheduled tasks

Motivation:

fix memory leak

Modification:

added a new release method and it will be called in ring buffer

Result:

to avoid memory leaks

transport-native-io_uring/src/main/java/io/netty/channel/uring/IOUringSubmissionQueue.java

@@ -230,6 +230,11 @@ final class IOUringSubmissionQueue {
         PlatformDependent.putLong(timeoutMemoryAddress + KERNEL_TIMESPEC_TV_NSEC_FIELD, nanoSeconds);
     }
 
+    //delete memory
+    public void release() {
+        Buffer.free(timeoutMemory);
+    }
+
     public void setSqeHead(long sqeHead) {
         this.sqeHead = sqeHead;
     }

transport-native-io_uring/src/main/java/io/netty/channel/uring/RingBuffer.java

@@ -34,6 +34,7 @@ final class RingBuffer {
   }
 
   public void close() {
+      getIoUringSubmissionQueue().release();
       Native.ioUringExit(this);
   }
 

transport-native-io_uring/src/test/java/io/netty/channel/uring/NativeTest.java

@@ -164,5 +164,13 @@ public class NativeTest {
         }.start();
 
         waitingCqe.join();
+
+        ringBuffer.close();
+    }
+
+    @Test
+    public void ioUringExitTest() {
+        RingBuffer ringBuffer = Native.createRingBuffer();
+        ringBuffer.close();
     }
 }