staging: comedi: ni_660x: remove #include "comedi_fc.h"

"ni_660x.c" doesn't use anything from "comedi_fc.h".
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/ni_660x.c

@@ -39,7 +39,6 @@
 
 #include "../comedi_pci.h"
 
-#include "comedi_fc.h"
 #include "mite.h"
 #include "ni_tio.h"