The driver neglects to check the result of platform_get_irq()'s call and
blithely passes the negative error codes to request_irq() (which takes
*unsigned* IRQ #), causing it to fail with -EINVAL, overriding an original
error code. Stop calling request_irq() with the invalid IRQ #s.

Fixes: 0807c500a1a6 ("USB: add Freescale USB OTG Transceiver driver")
Signed-off-by: Sergey Shtylyov <redacted>

---
 drivers/usb/phy/phy-fsl-usb.c |    2 ++
 1 file changed, 2 insertions(+)

Index: usb/drivers/usb/phy/phy-fsl-usb.c
===================================================================

--- usb.orig/drivers/usb/phy/phy-fsl-usb.c
+++ usb/drivers/usb/phy/phy-fsl-usb.c

@@ -873,6 +873,8 @@ int usb_otg_start(struct platform_device
 
 	/* request irq */
 	p_otg->irq = platform_get_irq(pdev, 0);
+	if (p_otg->irq < 0)
+		return p_otg->irq;
 	status = request_irq(p_otg->irq, fsl_otg_isr,
 				IRQF_SHARED, driver_name, p_otg);
 	if (status) {