usb: host: ehci-tegra: Fix error handling in tegra_ehci_probe()

If the function platform_get_irq() failed, the negative value
returned will not be detected here. So fix error handling in
tegra_ehci_probe().

Fixes: 79ad3b5a ("usb: host: Add EHCI driver for NVIDIA Tegra SoCs")
Acked-by: NAlan Stern <stern@rowland.harvard.edu>
Acked-by: NThierry Reding <treding@nvidia.com>
Signed-off-by: NTang Bin <tangbin@cmss.chinamobile.com>
Link: https://lore.kernel.org/r/20201026090657.49988-1-tangbin@cmss.chinamobile.comSigned-off-by: NGreg Kroah-Hartman <gregkh@linuxfoundation.org>

drivers/usb/host/ehci-tegra.c

@@ -479,8 +479,8 @@ static int tegra_ehci_probe(struct platform_device *pdev)
 	u_phy->otg->host = hcd_to_bus(hcd);
 
 	irq = platform_get_irq(pdev, 0);
-	if (!irq) {
-		err = -ENODEV;
+	if (irq < 0) {
+		err = irq;
 		goto cleanup_phy;
 	}