staging: dgap: redundant NULL and magic check in dgap_get_modem_info()

The "ch" is already checking in caller.
Signed-off-by: Daeseok Youn <daeseok.youn@gmail.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

drivers/staging/dgap/dgap.c

@@ -3061,9 +3061,6 @@ static int dgap_get_modem_info(struct channel_t *ch, unsigned int __user *value)
 	ulong lock_flags;
 	int rc;
 
-	if (!ch || ch->magic != DGAP_CHANNEL_MAGIC)
-		return -EIO;
-
 	spin_lock_irqsave(&ch->ch_lock, lock_flags);
 
 	mstat = readb(&(ch->ch_bs->m_stat));