USB: core: message: fix sparse warning

Fix the following sparse warning:

drivers/usb/core/message.c:1583:6: warning: symbol '__usb_queue_reset_device' was not declared. Should it be static?

Signed-off-by: Felipe Balbi <felipe.balbi@nokia.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>