spi: dw: Fix error return code in dw_spi_bt1_probe()

Fix to return a negative error code from the error handling
case instead of 0, as done elsewhere in this function.

Fixes: abf00907 ("spi: dw: Add Baikal-T1 SPI Controller glue driver")
Reported-by: Hulk Robot <hulkci@huawei.com>
Signed-off-by: Zhang Changzhong <zhangchangzhong@huawei.com>
Acked-by: Serge Semin <fancer.lancer@gmail.com>
Link: https://lore.kernel.org/r/1607071357-33378-1-git-send-email-zhangchangzhong@huawei.comSigned-off-by: Mark Brown <broonie@kernel.org>

drivers/spi/spi-dw-bt1.c

@@ -280,8 +280,10 @@ static int dw_spi_bt1_probe(struct platform_device *pdev)
 	dws->bus_num = pdev->id;
 	dws->reg_io_width = 4;
 	dws->max_freq = clk_get_rate(dwsbt1->clk);
-	if (!dws->max_freq)
+	if (!dws->max_freq) {
+		ret = -EINVAL;
 		goto err_disable_clk;
+	}
 
 	init_func = device_get_match_data(&pdev->dev);
 	ret = init_func(pdev, dwsbt1);