staging: comedi: ni_660x: checkpatch.pl cleanup (else not useful)

Fix the checkpatch.pl warning:

WARNING: else is not generally useful after a break or return
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_660x.c

@@ -310,10 +310,7 @@ enum clock_config_register_bits {
 /* ioconfigreg */
 static inline unsigned ioconfig_bitshift(unsigned pfi_channel)
 {
-	if (pfi_channel % 2)
-		return 0;
-	else
-		return 8;
+	return (pfi_channel % 2) ? 0 : 8;
 }
 
 static inline unsigned pfi_output_select_mask(unsigned pfi_channel)