staging: dgnc: redundant NULL checks before kfree()

Removed redundant NULL checks before calling kfree()
Signed-off-by: Vitaly Osipov <vitaly.osipov@gmail.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

drivers/staging/dgnc/dgnc_driver.c

@@ -448,19 +448,14 @@ static void dgnc_cleanup_board(struct dgnc_board *brd)
 	/* Free all allocated channels structs */
 	for (i = 0; i < MAXPORTS ; i++) {
 		if (brd->channels[i]) {
-			if (brd->channels[i]->ch_rqueue)
 			kfree(brd->channels[i]->ch_rqueue);
-			if (brd->channels[i]->ch_equeue)
 			kfree(brd->channels[i]->ch_equeue);
-			if (brd->channels[i]->ch_wqueue)
 			kfree(brd->channels[i]->ch_wqueue);
-
 			kfree(brd->channels[i]);
 			brd->channels[i] = NULL;
 		}
 	}
 
-	if (brd->flipbuf)
 	kfree(brd->flipbuf);
 
 	dgnc_Board[brd->boardnum] = NULL;