staging: dgrp: fix some warnings

Just squashing these to get them out of the analysis queue.

nd_ps_desc is an array not a pointer so comparing it with NULL is silly (be
nice if gcc shouted about this). And there are some slightly pointless
comparisons too.
Signed-off-by: Alan Cox <alan@linux.intel.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

drivers/staging/dgrp/dgrp_dpa_ops.c

@@ -387,7 +387,7 @@ static long dgrp_dpa_ioctl(struct file *file, unsigned int cmd,
 
 		port = getchan.ch_port;
 
-		if (port < 0 || port > nd->nd_chan_count)
+		if (port > nd->nd_chan_count)
 			return -EINVAL;
 
 		ch = nd->nd_chan + port;

drivers/staging/dgrp/dgrp_net_ops.c

@@ -1671,6 +1671,9 @@ static int dgrp_send(struct nd_struct *nd, long tmax)
 				 * do the job.
 				 */
 
+				/* FIXME: jiffies - ch->ch_waketime can never
+				   be < 0. Someone needs to work out what is
+				   actually intended here */
 				if (ch->ch_pun.un_open_count &&
 				    (ch->ch_pun.un_flag &
 				    (UN_EMPTY|UN_TIME|UN_LOW|UN_PWAIT)) != 0) {

drivers/staging/dgrp/dgrp_sysfs.c

@@ -177,7 +177,7 @@ static ssize_t dgrp_node_description_show(struct device *c,
 	if (!nd)
 		return 0;
 
-	if (nd->nd_state == NS_READY && nd->nd_ps_desc)
+	if (nd->nd_state == NS_READY)
 		return snprintf(buf, PAGE_SIZE, "%s\n", nd->nd_ps_desc);
 	return 0;
 }