staging: comedi: ni_labpc: don't clear cmd3 bits explicitly in labpc_ai_cmd()

`labpc_ai_cmd()` calls `labpc_cancel()` which already sets
`devpriv->cmd3` to 0.  Remove the lines from `labpc_ai_cmd()` that clear
specific bits in `devpriv->cmd3` explicitly as they have no effect.

Signed-off-by: Ian Abbott <abbotti@mev.co.uk>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

drivers/staging/comedi/drivers/ni_labpc.c

@@ -976,8 +976,7 @@ static int labpc_ai_cmd(struct comedi_device *dev, struct comedi_subdevice *s)
 		release_dma_lock(irq_flags);
 		/*  enable board's dma */
 		devpriv->cmd3 |= (CMD3_DMAEN | CMD3_DMATCINTEN);
-	} else
-		devpriv->cmd3 &= ~(CMD3_DMAEN | CMD3_DMATCINTEN);
+	}
 #endif
 
 	/*  enable error interrupts */
@@ -985,8 +984,6 @@ static int labpc_ai_cmd(struct comedi_device *dev, struct comedi_subdevice *s)
 	/*  enable fifo not empty interrupt? */
 	if (xfer == fifo_not_empty_transfer)
 		devpriv->cmd3 |= CMD3_FIFOINTEN;
-	else
-		devpriv->cmd3 &= ~CMD3_FIFOINTEN;
 	devpriv->write_byte(devpriv->cmd3, dev->iobase + CMD3_REG);
 
 	/*  setup any external triggering/pacing (cmd4 register) */