firmware: tegra: Fix error return code in tegra210_bpmp_init()

When call irq_get_irq_data() to get the IRQ's irq_data failed, an
appropriate error code -ENOENT should be returned. However, we directly
return 'err', which records the IRQ number instead of the error code.

Fixes: 139251fc2208 ("firmware: tegra: add bpmp driver for Tegra210")
Reported-by: Hulk Robot <[e-mail]>
Signed-off-by: Zhen Lei <[e-mail]>
Signed-off-by: Thierry Reding <[e-mail]>

drivers/firmware/tegra/bpmp-tegra210.c

···
 	priv->tx_irq_data = irq_get_irq_data(err);
 	if (!priv->tx_irq_data) {
 		dev_err(&pdev->dev, "failed to get IRQ data for TX IRQ\n");
-		return err;
+		return -ENOENT;
 	}
 
 	err = platform_get_irq_byname(pdev, "rx");