Fix DMABuf FD closure for IPC attach client

We should also close the client side dmabuf fd after importing for target
nodes.

Change-Id: I74f61dd65bebb03dc002f5df7301efd1ef8d9603

runtime/hsa-runtime/core/runtime/runtime.cpp

@@ -1375,6 +1375,7 @@ hsa_status_t Runtime::IPCAttach(const hsa_amd_ipc_memory_t* handle, size_t len,
   if (ret != HSA_STATUS_SUCCESS) return HSA_STATUS_ERROR_INVALID_ARGUMENT;
 
   if (ipc_dmabuf_supported_) {
+    close(dmabuf_fd);
     importAddress = info.MemoryAddress;
     importSize = info.SizeInBytes;
   }