USB: remove warn() macro from usb drivers

USB should not be having it's own printk macros, so remove warn() and
use the system-wide standard of dev_warn() wherever possible.  In the
few places that will not work out, use a basic printk().

Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>

drivers/usb/core/message.c

@@ -1204,7 +1204,8 @@ int usb_set_interface(struct usb_device *dev, int interface, int alternate)
 
 	alt = usb_altnum_to_altsetting(iface, alternate);
 	if (!alt) {
-		warn("selecting invalid altsetting %d", alternate);
+		dev_warn(&dev->dev, "selecting invalid altsetting %d",
+			 alternate);
 		return -EINVAL;
 	}