hsi: correctly handle return value of kzalloc

Since kzalloc can be failed in memory pressure,
its return value should be checked and handled.

Signed-off-by: Insu Yun <[e-mail]>
Signed-off-by: Sebastian Reichel <[e-mail]>

drivers/hsi/hsi.c

···
 
 	cl = kzalloc(sizeof(*cl), GFP_KERNEL);
 	if (!cl)
-		return NULL;
+		goto err;
 
 	cl->tx_cfg = info->tx_cfg;
 	if (cl->tx_cfg.channels) {
 		size = cl->tx_cfg.num_channels * sizeof(*cl->tx_cfg.channels);
 		cl->tx_cfg.channels = kzalloc(size , GFP_KERNEL);
+		if (!cl->tx_cfg.channels)
+			goto err_tx;
 		memcpy(cl->tx_cfg.channels, info->tx_cfg.channels, size);
 	}
 
···
 	if (cl->rx_cfg.channels) {
 		size = cl->rx_cfg.num_channels * sizeof(*cl->rx_cfg.channels);
 		cl->rx_cfg.channels = kzalloc(size , GFP_KERNEL);
+		if (!cl->rx_cfg.channels)
+			goto err_rx;
 		memcpy(cl->rx_cfg.channels, info->rx_cfg.channels, size);
 	}
 
···
 	}
 
 	return cl;
+err_rx:
+	kfree(cl->tx_cfg.channels);
+err_tx:
+	kfree(cl);
+err:
+	return NULL;
 }
 EXPORT_SYMBOL_GPL(hsi_new_client);