staging: comedi: ni_stc.h: remove n_ni_boards macro

This macro is not used, remove it.
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_stc.h

@@ -1421,8 +1421,6 @@ struct ni_board_struct {
 	enum caldac_enum caldac[3];
 };
 
-#define n_ni_boards  (sizeof(ni_boards)/sizeof(struct ni_board_struct))
-
 #define MAX_N_AO_CHAN 8
 #define NUM_GPCT 2