USB: host: ehci-mxc: Add error handling in ehci_mxc_drv_probe()

The function ehci_mxc_drv_probe() does not perform sufficient error
checking after executing platform_get_irq(), thus fix it.

Fixes: 7e8d5cd9 ("USB: Add EHCI support for MX27 and MX31 based boards")
Signed-off-by: Zhang Shengju <zhangshengju@cmss.chinamobile.com>
Signed-off-by: Tang Bin <tangbin@cmss.chinamobile.com>
Reviewed-by: Peter Chen <peter.chen@nxp.com>
Link: https://lore.kernel.org/r/20200513132647.5456-1-tangbin@cmss.chinamobile.comSigned-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

drivers/usb/host/ehci-mxc.c

@@ -50,6 +50,8 @@ static int ehci_mxc_drv_probe(struct platform_device *pdev)
 	}
 
 	irq = platform_get_irq(pdev, 0);
+	if (irq < 0)
+		return irq;
 
 	hcd = usb_create_hcd(&ehci_mxc_hc_driver, dev, dev_name(dev));
 	if (!hcd)