staging: comedi: ni_tio_internal.c: 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_tio_internal.h

@@ -334,11 +334,9 @@ static inline int ni_tio_counting_mode_registers_present(const struct
 	switch (counter_dev->variant) {
 	case ni_gpct_variant_e_series:
 		return 0;
-		break;
 	case ni_gpct_variant_m_series:
 	case ni_gpct_variant_660x:
 		return 1;
-		break;
 	default:
 		BUG();
 		break;