hidl_memory no longer owns passed-in handles.

So clean them up when done.

Bug: 33812533
Test: mma
Change-Id: Ic2fdfa703547a210b9915288d5a77dc8e329a1c6
diff --git a/audio/2.0/default/Stream.h b/audio/2.0/default/Stream.h
index 0bbd803..73afe05 100644
--- a/audio/2.0/default/Stream.h
+++ b/audio/2.0/default/Stream.h
@@ -127,6 +127,7 @@
                                              IStream::createMmapBuffer_cb _hidl_cb) {
     Result retval(Result::NOT_SUPPORTED);
     MmapBufferInfo info;
+    native_handle_t* hidlHandle = nullptr;
 
     if (mStream->create_mmap_buffer != NULL) {
         struct audio_mmap_buffer_info halInfo;
@@ -134,7 +135,7 @@
                 "create_mmap_buffer",
                 mStream->create_mmap_buffer(mStream, minSizeFrames, &halInfo));
         if (retval == Result::OK) {
-            native_handle_t* hidlHandle = native_handle_create(1, 0);
+            hidlHandle = native_handle_create(1, 0);
             hidlHandle->data[0] = halInfo.shared_memory_fd;
             info.sharedMemory = hidl_memory("audio_buffer", hidlHandle,
                                             frameSize *halInfo.buffer_size_frames);
@@ -143,6 +144,10 @@
         }
     }
     _hidl_cb(retval, info);
+    if (hidlHandle != nullptr) {
+        native_handle_close(hidlHandle);
+        native_handle_delete(hidlHandle);
+    }
     return Void();
 }