/* Doesn't already exist.  Allocate a structure to hold it */
        mcaddr = kmalloc(sizeof(*mcaddr), GFP_ATOMIC);
-       if (mcaddr == NULL)
+       if (!mcaddr)
                return 1;
 
        ether_addr_copy(mcaddr->address, address);
 {
        if (adapter->xmitq_full)
                netif_stop_queue(adapter->netdev);
-       if ((cmd == NULL) && (status <= XMIT_FAIL_HOSTCMD_FAIL)) {
+       if ((!cmd) && (status <= XMIT_FAIL_HOSTCMD_FAIL)) {
                switch (status) {
                case XMIT_FAIL_LINK_STATE:
                        dev_err(&adapter->netdev->dev,
        /* Initialize a new card structure if need be */
        if (card_hostid == SLIC_HOSTID_DEFAULT) {
                card = kzalloc(sizeof(*card), GFP_KERNEL);
-               if (card == NULL)
+               if (!card)
                        return -ENOMEM;
 
                card->next = slic_global.slic_card;