staging: dgnc: remove redundant NULL check in

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>

diff --git a/drivers/staging/dgnc/dgnc_tty.c b/drivers/staging/dgnc/dgnc_tty.c
index 7f73a4104ec31856c486847606a1b5455abff05b..c07897afdd7c29a4539e5deb750171eb4a097c97 100644 (file)
--- a/drivers/staging/dgnc/dgnc_tty.c
+++ b/drivers/staging/dgnc/dgnc_tty.c
@@ -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