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staging: dgnc: remove redundant NULL check in

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There were already checking NULL about channel_t / un_t
before calling dgnc_maxcps_room().

Signed-off-by: Daeseok Youn <daeseok.youn@gmail.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Daeseok Youn 2016-04-05 18:30:02 +09:00 committed by Greg Kroah-Hartman
parent 16f10a825d
commit e47e7379ce
1 changed files with 2 additions and 13 deletions
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15
drivers/staging/dgnc/dgnc_tty.c
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@ -1536,19 +1536,8 @@ static int dgnc_tty_chars_in_buffer(struct tty_struct *tty)
*/
static int dgnc_maxcps_room(struct tty_struct *tty, int bytes_available)
{
struct channel_t *ch = NULL;
struct un_t *un = NULL;
if (!tty)
return bytes_available;
un = tty->driver_data;
if (!un || un->magic != DGNC_UNIT_MAGIC)
return bytes_available;
ch = un->un_ch;
if (!ch || ch->magic != DGNC_CHANNEL_MAGIC)
return bytes_available;
struct un_t *un = tty->driver_data;
struct channel_t *ch = un->un_ch;
/*
* If its not the Transparent print device, return