tty-usb-sierra: Coding style - minor

Signed-off-by: NAlan Cox <alan@redhat.com>
Signed-off-by: NGreg Kroah-Hartman <gregkh@suse.de>
Signed-off-by: NLinus Torvalds <torvalds@linux-foundation.org>

drivers/usb/serial/sierra.c

@@ -757,7 +757,7 @@ static int __init sierra_init(void)
 
 static void __exit sierra_exit(void)
 {
-	usb_deregister (&sierra_driver);
+	usb_deregister(&sierra_driver);
 	usb_serial_deregister(&sierra_device);
 }