net: cpsw: Add NULL pointer check

Add null pointer check to take care of out of memory errors.

Signed-off-by: Faiz Abbas <faiz_abbas@ti.com>
Reviewed-by: Grygorii Strashko <grygorii.strashko@ti.com>
diff --git a/drivers/net/ti/cpsw.c b/drivers/net/ti/cpsw.c
index 93d5361..5762562 100644
--- a/drivers/net/ti/cpsw.c
+++ b/drivers/net/ti/cpsw.c
@@ -1224,6 +1224,9 @@
 	int ret;
 
 	data = calloc(1, sizeof(struct cpsw_platform_data));
+	if (!data)
+		return -ENOMEM;
+
 	pdata->priv_pdata = data;
 	pdata->iobase = dev_read_addr(dev);
 	data->version = CPSW_CTRL_VERSION_2;