carma-fpga: Cocci spatch "ptr_ret.spatch"

diff -u -p a/drivers/misc/carma/carma-fpga.c b/drivers/misc/carma/carma-fpga.c
@@ -954,10 +954,7 @@ static int data_debugfs_init(struct fpga
 {
 	priv->dbg_entry = debugfs_create_file(drv_name, S_IRUGO, NULL, priv,
 					      &data_debug_fops);
-	if (IS_ERR(priv->dbg_entry))
-		return PTR_ERR(priv->dbg_entry);
-
-	return 0;
+	return PTR_RET(priv->dbg_entry);
 }
 
 static void data_debugfs_exit(struct fpga_device *priv)