spi: meson-spicc: Fix error handling in meson_spicc_probe()

If devm_spi_register_master() fails in meson_spicc_probe(),
spicc->core is left undisabled. The patch fixes that.

Found by Linux Driver Verification project (linuxtesting.org).
Signed-off-by: Alexey Khoroshilov <khoroshilov@ispras.ru>
Reviewed-by: Neil Armstrong <narmstrong@baylibre.com>
Signed-off-by: Mark Brown <broonie@kernel.org>

drivers/spi/spi-meson-spicc.c

@@ -574,10 +574,15 @@ static int meson_spicc_probe(struct platform_device *pdev)
 		master->max_speed_hz = rate >> 2;
 
 	ret = devm_spi_register_master(&pdev->dev, master);
-	if (!ret)
-		return 0;
+	if (ret) {
+		dev_err(&pdev->dev, "spi master registration failed\n");
+		goto out_clk;
+	}
 
-	dev_err(&pdev->dev, "spi master registration failed\n");
+	return 0;
+
+out_clk:
+	clk_disable_unprepare(spicc->core);
 
 out_master:
 	spi_master_put(master);