Fixed build errors for linx_mod with kernel 3.12.X.

For details, see [LXCR-3427].

Upstream-Status: Not Applicable

Signed-off-by: Liviu Gheorghisan <liviu.gheorghisan@enea.com>

---
--- a/af_linx.c	2014-04-02 10:19:44.000000000 +0300
+++ b/af_linx.c	2014-07-23 17:40:01.629687646 +0300
@@ -1034,8 +1034,11 @@
       failure:
 	*errcode = err;
 	return NULL;
-#else
+#elif LINUX_VERSION_CODE < KERNEL_VERSION(3,12,0)
 	return sock_alloc_send_pskb(sk, 0, data_len, 0, errcode);
+#else
+	/* max_page_order == 0 => no paged allocations */
+	return sock_alloc_send_pskb(sk, 0, data_len, 0, errcode, 0);
 #endif
 }