Move assignments out of if conditions to comply with
the Linux Kernel coding style and improve code
readability. This also switches to the preferred
'if (!ptr)' idiom for NULL pointer checks.

Signed-off-by: Mashiro Chen <mashiro.chen@mailbox.org>
---
 drivers/net/hamradio/mkiss.c | 9 ++++++---
 1 file changed, 6 insertions(+), 3 deletions(-)

diff --git a/drivers/net/hamradio/mkiss.c b/drivers/net/hamradio/mkiss.c
index 5f38a002b..eac45d936 100644
--- a/drivers/net/hamradio/mkiss.c
+++ b/drivers/net/hamradio/mkiss.c
@@ -282,7 +282,8 @@ static void ax_bump(struct mkiss *ax)
 
 	count = ax->rcount;
 
-	if ((skb = dev_alloc_skb(count)) == NULL) {
+	skb = dev_alloc_skb(count);
+	if (!skb) {
 		printk(KERN_ERR "mkiss: %s: memory squeeze, dropping packet.\n",
 		       ax->dev->name);
 		ax->dev->stats.rx_dropped++;
@@ -591,10 +592,12 @@ static int ax_open(struct net_device *dev)
 	if (len < 576 * 2)
 		len = 576 * 2;
 
-	if ((ax->rbuff = kmalloc(len + 4, GFP_KERNEL)) == NULL)
+	ax->rbuff = kmalloc(len + 4, GFP_KERNEL);
+	if (!ax->rbuff)
 		goto norbuff;
 
-	if ((ax->xbuff = kmalloc(len + 4, GFP_KERNEL)) == NULL)
+	ax->xbuff = kmalloc(len + 4, GFP_KERNEL);
+	if (!ax->xbuff)
 		goto noxbuff;
 
 	ax->mtu	     = dev->mtu + 73;
-- 
2.53.0