Staging: udlfb: fix printk format warning

Fix printk format warning: use %td for ptrdiff:

drivers/staging/udlfb/udlfb.h:209: warning: format '%d' expects type 'int', but argument 3 has type 'long int'
Signed-off-by: Randy Dunlap <randy.dunlap@oracle.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>

drivers/staging/udlfb/udlfb.h

@@ -205,7 +205,7 @@ static int dlfb_set_video_mode(struct dlfb_data *dev_info, int width, int height
 
 			/* send */
 			ret = dlfb_bulk_msg(dev_info, bufptr - dev_info->buf);
-			printk("ret bulk 2: %d %d\n", ret,
+			printk("ret bulk 2: %d %td\n", ret,
 			       bufptr - dev_info->buf);
 
 			/* flush */