usb: ehci-omap: fix error return code in ehci_hcd_omap_probe()

platform_get_irq() returns an error code, but the ehci-omap driver
ignores it and always returns -ENODEV. This is not correct and,
prevents -EPROBE_DEFER from being propagated properly.

Also, notice that platform_get_irq() no longer returns 0 on error:
https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=e330b9a6bb35dc7097a4f02cb1ae7b6f96df92af

Print and propagate the return value of platform_get_irq on failure.

This issue was detected with the help of Coccinelle.

Signed-off-by: Gustavo A. R. Silva <gustavo@embeddedor.com>
Acked-by: Alan Stern <stern@rowland.harvard.edu>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

drivers/usb/host/ehci-omap.c

@@ -130,8 +130,8 @@ static int ehci_hcd_omap_probe(struct platform_device *pdev)
 
 	irq = platform_get_irq(pdev, 0);
 	if (irq < 0) {
-		dev_err(dev, "EHCI irq failed\n");
-		return -ENODEV;
+		dev_err(dev, "EHCI irq failed: %d\n", irq);
+		return irq;
 	}
 
 	res =  platform_get_resource(pdev, IORESOURCE_MEM, 0);