Staging: dgnc: removing the comparison 'board<0'

Fix dgnc_mgmt_ioctl() warn: unsigned 'board' is never less than zero.
Signed-off-by: Ashvini Varatharaj <ashvinivaratharaj@gmail.com>
Reviewed-by: Peter P Waskiewicz Jr <peter.p.waskiewicz.jr@intel.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

drivers/staging/dgnc/dgnc_mgmt.c

@@ -220,7 +220,7 @@ long dgnc_mgmt_ioctl(struct file *file, unsigned int cmd, unsigned long arg)
 		channel = ni.channel;
 
 		/* Verify boundaries on board */
-		if ((board < 0) || (board > dgnc_NumBoards) || (dgnc_NumBoards == 0))
+		if ((board > dgnc_NumBoards) || (dgnc_NumBoards == 0))
 			return -ENODEV;
 
 		/* Verify boundaries on channel */