Staging: comedi: add a missing break statement

This is a static checker fix. From the context it looks like there
should be a break here.

Signed-off-by: Dan Carpenter <[e-mail]>
Acked-by: Ian Abbott <[e-mail]>
Signed-off-by: Greg Kroah-Hartman <[e-mail]>

drivers/staging/comedi/drivers/ni_tiocmd.c

···
 		async->inttrig = NULL;
 		mite_dma_arm(counter->mite_chan);
 		retval = ni_tio_arm(counter, 1, cmd->start_arg);
+		break;
 	case TRIG_OTHER:
 		async->inttrig = NULL;
 		mite_dma_arm(counter->mite_chan);