can: slcan: convert comparison to NULL into !val

All comparison to NULL could be written "!val", convert them to make
checkpatch happy.

Link: https://lore.kernel.org/all/20220704125954.1587880-5-mkl@pengutronix.de
Signed-off-by: Marc Kleine-Budde <mkl@pengutronix.de>

diff --git a/drivers/net/can/slcan/slcan-core.c b/drivers/net/can/slcan/slcan-core.c
index aa15c06..70a6d1b 100644 (file)
--- a/drivers/net/can/slcan/slcan-core.c
+++ b/drivers/net/can/slcan/slcan-core.c
@@ -618,7 +618,7 @@ static netdev_tx_t slc_xmit(struct sk_buff *skb, struct net_device *dev)
                netdev_warn(dev, "xmit: iface is down\n");
                goto out;
        }
-       if (sl->tty == NULL) {
+       if (!sl->tty) {
                spin_unlock(&sl->lock);
                goto out;
        }
@@ -707,7 +707,7 @@ static int slc_open(struct net_device *dev)
        unsigned char cmd[SLC_MTU];
        int err, s;
 
-       if (sl->tty == NULL)
+       if (!sl->tty)
                return -ENODEV;
 
        /* The baud rate is not set with the command
@@ -834,7 +834,7 @@ static void slc_sync(void)
 
        for (i = 0; i < maxdev; i++) {
                dev = slcan_devs[i];
-               if (dev == NULL)
+               if (!dev)
                        break;
 
                sl = netdev_priv(dev);
@@ -854,9 +854,8 @@ static struct slcan *slc_alloc(void)
 
        for (i = 0; i < maxdev; i++) {
                dev = slcan_devs[i];
-               if (dev == NULL)
+               if (!dev)
                        break;
-
        }
 
        /* Sorry, too many, all slots in use */
@@ -902,7 +901,7 @@ static int slcan_open(struct tty_struct *tty)
        if (!capable(CAP_NET_ADMIN))
                return -EPERM;
 
-       if (tty->ops->write == NULL)
+       if (!tty->ops->write)
                return -EOPNOTSUPP;
 
        /* RTnetlink lock is misused here to serialize concurrent
@@ -924,7 +923,7 @@ static int slcan_open(struct tty_struct *tty)
        /* OK.  Find a free SLCAN channel to use. */
        err = -ENFILE;
        sl = slc_alloc();
-       if (sl == NULL)
+       if (!sl)
                goto err_exit;
 
        sl->tty = tty;
@@ -1071,7 +1070,7 @@ static void __exit slcan_exit(void)
        unsigned long timeout = jiffies + HZ;
        int busy = 0;
 
-       if (slcan_devs == NULL)
+       if (!slcan_devs)
                return;
 
        /* First of all: check for active disciplines and hangup them.