hwrng: rockchip - rst is used only during probe

The driver uses the rst variable only for an initial reset when the chip
is probed. There's no need to store rst in the driver's private data, we
can make it a local variable in the probe function.
Signed-off-by: Martin Kaiser <martin@kaiser.cx>
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>

drivers/char/hw_random/rockchip-rng.c

@@ -52,7 +52,6 @@
 struct rk_rng {
 	struct hwrng rng;
 	void __iomem *base;
-	struct reset_control *rst;
 	int clk_num;
 	struct clk_bulk_data *clk_bulks;
 };
@@ -132,6 +131,7 @@ static int rk_rng_read(struct hwrng *rng, void *buf, size_t max, bool wait)
 static int rk_rng_probe(struct platform_device *pdev)
 {
 	struct device *dev = &pdev->dev;
+	struct reset_control *rst;
 	struct rk_rng *rk_rng;
 	int ret;
 
@@ -148,14 +148,13 @@ static int rk_rng_probe(struct platform_device *pdev)
 		return dev_err_probe(dev, rk_rng->clk_num,
 				     "Failed to get clks property\n");
 
-	rk_rng->rst = devm_reset_control_array_get_exclusive(&pdev->dev);
-	if (IS_ERR(rk_rng->rst))
-		return dev_err_probe(dev, PTR_ERR(rk_rng->rst),
-				     "Failed to get reset property\n");
+	rst = devm_reset_control_array_get_exclusive(&pdev->dev);
+	if (IS_ERR(rst))
+		return dev_err_probe(dev, PTR_ERR(rst), "Failed to get reset property\n");
 
-	reset_control_assert(rk_rng->rst);
+	reset_control_assert(rst);
 	udelay(2);
-	reset_control_deassert(rk_rng->rst);
+	reset_control_deassert(rst);
 
 	platform_set_drvdata(pdev, rk_rng);