staging: fbtft: remove unused variable 'count'

The variable count is being initialized and incremented but it is never
actually referenced in any other way. The variable is redundant and can
be removed.

Cleans up clang scan build warning:
drivers/staging/fbtft/fbtft-core.c:330:6: warning: variable 'count' set
but not used [-Wunused-but-set-variable]
Signed-off-by: Colin Ian King <colin.i.king@gmail.com>
Link: https://lore.kernel.org/r/20240229120114.219085-1-colin.i.king@gmail.comSigned-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

drivers/staging/fbtft/fbtft-core.c

@@ -327,7 +327,6 @@ static void fbtft_deferred_io(struct fb_info *info, struct list_head *pagereflis
 	unsigned int dirty_lines_start, dirty_lines_end;
 	struct fb_deferred_io_pageref *pageref;
 	unsigned int y_low = 0, y_high = 0;
-	int count = 0;
 
 	spin_lock(&par->dirty_lock);
 	dirty_lines_start = par->dirty_lines_start;
@@ -339,7 +338,6 @@ static void fbtft_deferred_io(struct fb_info *info, struct list_head *pagereflis
 
 	/* Mark display lines as dirty */
 	list_for_each_entry(pageref, pagereflist, list) {
-		count++;
 		y_low = pageref->offset / info->fix.line_length;
 		y_high = (pageref->offset + PAGE_SIZE - 1) / info->fix.line_length;
 		dev_dbg(info->device,