SYSLINK: ipc - heapbuf_close frees obj

When a heapbuf object is created, there are two memory buffers allocated -- one
for the handle and one for the object itself.  That is in _heapbuf_create.  In
heapbuf_delete, both are freed.  But in heapbuf_close, only the handle is freed.
The object pointer is not freed and caused a memory leak.  This patch adds a
call to free the object.
Signed-off-by: Simon Que <sque@ti.com>

drivers/dsp/syslink/multicore_ipc/heapbuf.c

@@ -837,6 +837,7 @@ int heapbuf_close(void *handle_ptr)
 			/* Delete the list */
 			listmp_sharedmemory_close((listmp_sharedmemory_handle *)
 				obj->free_list);
+			kfree(obj);
 			kfree(handle);
 			handle = NULL;
 		}