USB: fix compiler warning fix

This patch (as1123b) fixes a compiler warning: do_unbind_rebind() is
defined but not used if CONFIG_PM=n.

Problem originally found and initial patch submitted by Alexander
Beregalov <a.beregalov@gmail.com>.
Signed-off-by: Alan Stern <stern@rowland.harvard.edu>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>

drivers/usb/core/driver.c

@@ -774,8 +774,6 @@ void usb_deregister(struct usb_driver *driver)
 }
 EXPORT_SYMBOL_GPL(usb_deregister);
 
-#ifdef CONFIG_PM
-
 /* Forced unbinding of a USB interface driver, either because
  * it doesn't support pre_reset/post_reset/reset_resume or
  * because it doesn't support suspend/resume.
@@ -822,6 +820,8 @@ void usb_rebind_intf(struct usb_interface *intf)
 		dev_warn(&intf->dev, "rebind failed: %d\n", rc);
 }
 
+#ifdef CONFIG_PM
+
 #define DO_UNBIND	0
 #define DO_REBIND	1