Support changed sock_create_kern() interface from Linux 4.2.

devices/generic.c

@@ -212,8 +212,13 @@ int ec_gen_device_create_socket(
         return -ENOMEM;
     }
 
+#if LINUX_VERSION_CODE >= KERNEL_VERSION(4, 2, 0)
+    ret = sock_create_kern(&init_net, PF_PACKET, SOCK_RAW,
+            htons(ETH_P_ETHERCAT), &dev->socket);
+#else
     ret = sock_create_kern(PF_PACKET, SOCK_RAW, htons(ETH_P_ETHERCAT),
             &dev->socket);
+#endif
     if (ret) {
         printk(KERN_ERR PFX "Failed to create socket (ret = %i).\n", ret);
         return ret;