staging: dgnc: remove redundant NULL checks in

The dgnc_block_til_ready() is only used in dgnc_tty_open().
The unit data(struct un_t) was stored into tty->driver_data in dgnc_tty_open().
And also tty and un were tested about NULL so these variables doesn't
need to check for NULL in dgnc_block_til_ready().

Signed-off-by: Daeseok Youn <daeseok.youn@gmail.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

diff --git a/drivers/staging/dgnc/dgnc_tty.c b/drivers/staging/dgnc/dgnc_tty.c
index 4eeecc9..6758859 100644 (file)
--- a/drivers/staging/dgnc/dgnc_tty.c
+++ b/drivers/staging/dgnc/dgnc_tty.c
@@ -1172,17 +1172,12 @@ static int dgnc_block_til_ready(struct tty_struct *tty,
                                struct channel_t *ch)
 {
        int retval = 0;
-       struct un_t *un = NULL;
+       struct un_t *un = tty->driver_data;
        unsigned long flags;
        uint    old_flags = 0;
        int     sleep_on_un_flags = 0;
 
-       if (!tty || tty->magic != TTY_MAGIC || !file || !ch ||
-           ch->magic != DGNC_CHANNEL_MAGIC)
-               return -ENXIO;
-
-       un = tty->driver_data;
-       if (!un || un->magic != DGNC_UNIT_MAGIC)
+       if (!file)
                return -ENXIO;
 
        spin_lock_irqsave(&ch->ch_lock, flags);