staging: comedi: comedi_fc: use comedi_bytes_per_scan()

Since `cfc_bytes_per_scan()` is just an inline function that calls
`comedi_bytes_per_scan()`, replace calls to the former to the latter in
the "comedi_fc" module.  This is part of the migration of functionality
from the "comedi_fc" module to the core "comedi" module.
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/comedi_fc.c

@@ -25,7 +25,7 @@
 void cfc_inc_scan_progress(struct comedi_subdevice *s, unsigned int num_bytes)
 {
 	struct comedi_async *async = s->async;
-	unsigned int scan_length = cfc_bytes_per_scan(s);
+	unsigned int scan_length = comedi_bytes_per_scan(s);
 
 	async->scan_progress += num_bytes;
 	if (async->scan_progress >= scan_length) {