staging: comedi: s626: correct S626_CRAMSK_CLKPOL_A macro (unused)

The counter 'A' clock polarity field in the 'CRA' register is only 1 bit
wide, but the `S626_CRAMSK_CLKPOL_A` macro shows it as 2 bits wide,
which would overlap with the counter 'A' interrupt source field.  This
is harmless as the macro isn't actually used yet, but correct it anyway
as I want to use it!
Signed-off-by: Ian Abbott <abbotti@mev.co.uk>
Reviewed-by: H Hartley Sweeten <hsweeten@visionengravers.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

drivers/staging/comedi/drivers/s626.h

@@ -564,7 +564,7 @@
 #define S626_CRAMSK_LOADSRC_A	(3 << S626_CRABIT_LOADSRC_A)
 #define S626_CRAMSK_CLKMULT_A	(3 << S626_CRABIT_CLKMULT_A)
 #define S626_CRAMSK_INTSRC_A	(3 << S626_CRABIT_INTSRC_A)
-#define S626_CRAMSK_CLKPOL_A	(3 << S626_CRABIT_CLKPOL_A)
+#define S626_CRAMSK_CLKPOL_A	(1 << S626_CRABIT_CLKPOL_A)
 #define S626_CRAMSK_INDXSRC_A	(3 << S626_CRABIT_INDXSRC_A)
 #define S626_CRAMSK_CNTSRC_A	(3 << S626_CRABIT_CNTSRC_A)