staging: dgap: remove bogus null test in dgap_tty_init()

- The channels array were set to NULL in dgap_found_board().
- Removes redundant null check for channels array in for loop,
if one of the channel cannot be allocated, dgap_tty_init() just returns
an error.
Signed-off-by: Daeseok Youn <daeseok.youn@gmail.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

drivers/staging/dgap/dgap.c

@@ -1379,13 +1379,11 @@ static int dgap_tty_init(struct board_t *brd)
 	 * when the driver was first loaded.
 	 */
 	for (i = 0; i < brd->nasync; i++) {
-		if (!brd->channels[i]) {
 		brd->channels[i] =
 			kzalloc(sizeof(struct channel_t), GFP_KERNEL);
 		if (!brd->channels[i])
 			return -ENOMEM;
 	}
-	}
 
 	ch = brd->channels[0];
 	vaddr = brd->re_map_membase;
@@ -1398,9 +1396,6 @@ static int dgap_tty_init(struct board_t *brd)
 	/* Set up channel variables */
 	for (i = 0; i < brd->nasync; i++, ch = brd->channels[i], bs++) {
 
-		if (!brd->channels[i])
-			continue;
-
 		spin_lock_init(&ch->ch_lock);
 
 		/* Store all our magic numbers */