staging: comedi: ni_stc.h: add a 'is_m_series' flag to private data

The (board->reg_type & ni_reg_m_series_mask) test is commonly used
in ni_mio_common.c to detect if the driver is being used with a
National Instruments "M series" DAQ board. Simplify the code a bit
by adding an 'is_m_series' bit-field flag to the private data.
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_pcimio.c

@@ -1540,6 +1540,8 @@ static int pcimio_auto_attach(struct comedi_device *dev,
 	devpriv->writel		= pcimio_writel;
 
 	if (board->reg_type & ni_reg_m_series_mask) {
+		devpriv->is_m_series = 1;
+
 		devpriv->stc_writew	= m_series_stc_writew;
 		devpriv->stc_readw	= m_series_stc_readw;
 		devpriv->stc_writel	= m_series_stc_writel;
@@ -1573,7 +1575,7 @@ static int pcimio_auto_attach(struct comedi_device *dev,
 	if (devpriv->gpct_mite_ring[1] == NULL)
 		return -ENOMEM;
 
-	if (board->reg_type & ni_reg_m_series_mask)
+	if (devpriv->is_m_series)
 		m_series_init_eeprom_buffer(dev);
 	if (board->reg_type == ni_reg_6143)
 		init_6143(dev);

drivers/staging/comedi/drivers/ni_stc.h

@@ -1503,6 +1503,8 @@ struct ni_private {
 	struct mite_dma_descriptor_ring *ao_mite_ring;
 	struct mite_dma_descriptor_ring *cdo_mite_ring;
 	struct mite_dma_descriptor_ring *gpct_mite_ring[NUM_GPCT];
+
+	unsigned int is_m_series:1;
 };
 
 #endif /* _COMEDI_NI_STC_H */