staging: comedi: s626: specify bitshift for encoder A clock source

When setting the clock source for one of the 'A' encoders to operate in
"counter" mode in `s626_set_mode_a()`, bitshift the clock source value by
`S626_CRABIT_CLKSRC_A` for consistency with the other modes.  This has
no effect on the value since `S626_CRABIT_CLKSRC_A` is 0.
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.c

@@ -864,7 +864,7 @@ static void s626_set_mode_a(struct comedi_device *dev,
 		break;
 	default:		/* Counter Mode: */
 		/* Select ENC_C and ENC_D as clock/direction inputs. */
-		cra |= S626_CLKSRC_COUNTER;
+		cra |= S626_CLKSRC_COUNTER << S626_CRABIT_CLKSRC_A;
 		/* Clock polarity is passed through. */
 		cra |= (setup & S626_STDMSK_CLKPOL) <<
 		       (S626_CRABIT_CLKPOL_A - S626_STDBIT_CLKPOL);