USB: gadget: pxa25x_udc vbus sense initialization

Some code in the pxa25x_udc driver wrongly expects the value
of is_vbus_present() to be 0/1, not zero/nonzero ... cope.
Issue noted by Jaya Kumar <jayakumar.lkml@gmail.com>

This bug has been around since July 2007, and has a simple
workaround:  unplug the Linux gadget, then re-plug it.
Signed-off-by: NDavid Brownell <dbrownell@users.sourceforge.net>
Cc: Jaya Kumar <jayakumar.lkml@gmail.com>
Signed-off-by: NGreg Kroah-Hartman <gregkh@suse.de>

drivers/usb/gadget/pxa25x_udc.c

@@ -2198,7 +2198,7 @@ static int __init pxa25x_udc_probe(struct platform_device *pdev)
 	udc_disable(dev);
 	udc_reinit(dev);
 
-	dev->vbus = is_vbus_present();
+	dev->vbus = !!is_vbus_present();
 
 	/* irq setup after old hardware state is cleaned up */
 	retval = request_irq(irq, pxa25x_udc_irq,