spi: tegra20-sflash: fix to check return value of platform_get_irq() in tegra_sflash_probe()

The platform_get_irq might be failed and return a negative result. So
there should have an error handling code.

Fixed this by adding an error handling code.

Fixes: 8528547b ("spi: tegra: add spi driver for sflash controller")
Signed-off-by: Zhang Shurong <zhang_shurong@foxmail.com>
Link: https://lore.kernel.org/r/tencent_71FC162D589E4788C2152AAC84CD8D5C6D06@qq.comSigned-off-by: Mark Brown <broonie@kernel.org>

drivers/spi/spi-tegra20-sflash.c

@@ -455,7 +455,11 @@ static int tegra_sflash_probe(struct platform_device *pdev)
 		goto exit_free_master;
 	}
 
-	tsd->irq = platform_get_irq(pdev, 0);
+	ret = platform_get_irq(pdev, 0);
+	if (ret < 0)
+		goto exit_free_master;
+	tsd->irq = ret;
+
 	ret = request_irq(tsd->irq, tegra_sflash_isr, 0,
 			dev_name(&pdev->dev), tsd);
 	if (ret < 0) {