staging: comedi: ni_tiocmd: checkpatch.pl cleanup (break is not useful)

Fix the checkpatch.pl warning:

WARNING: break is not useful after a goto or return
Signed-off-by: H Hartley Sweeten <hsweeten@visionengravers.com>
Cc: Ian Abbott <abbotti@mev.co.uk>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

drivers/staging/comedi/drivers/ni_tiocmd.c

@@ -342,7 +342,6 @@ static int should_ack_gate(struct ni_gpct *counter)
 	    in register-level manual) */
 	case ni_gpct_variant_660x:
 		return 1;
-		break;
 	case ni_gpct_variant_e_series:
 		spin_lock_irqsave(&counter->lock, flags);
 		{