public/io/netif.h: fix typos

Unfortunately my patch 162a81ab "document control ring and toeplitz
hashing" contained a couple of typos. This patch fixes them.

Signed-off-by: Paul Durrant <paul.durrant@citrix.com>
Cc: Ian Campbell <ian.campbell@citrix.com>
Cc: Ian Jackson <ian.jackson@eu.citrix.com>
Cc: Jan Beulich <jbeulich@suse.com>
Cc: Keir Fraser <keir@xen.org>
Cc: Tim Deegan <tim@xen.org>
Acked-by: Ian Campbell <ian.campbell@citrix.com>

xen/include/public/io/netif.h

@@ -234,7 +234,7 @@
  * Result = ToeplitzHash(Buffer, 32)
  */
 #define _NETIF_CTRL_TOEPLITZ_HASH_IPV6     2
-#define NETIF_CTRL_TOEPLITZ_HASH_IPV6      (1 << _NETIF_CTRL_TOEPLITZ_HASH_IPV4)
+#define NETIF_CTRL_TOEPLITZ_HASH_IPV6      (1 << _NETIF_CTRL_TOEPLITZ_HASH_IPV6)
 
 /*
  * A hash calculated over an IP version 6 header and TCP header as
@@ -248,7 +248,7 @@
  * Result = ToeplitzHash(Buffer, 36)
  */
 #define _NETIF_CTRL_TOEPLITZ_HASH_IPV6_TCP 3
-#define NETIF_CTRL_TOEPLITZ_HASH_IPV6_TCP  (1 << _NETIF_CTRL_TOEPLITZ_HASH_IPV4_TCP)
+#define NETIF_CTRL_TOEPLITZ_HASH_IPV6_TCP  (1 << _NETIF_CTRL_TOEPLITZ_HASH_IPV6_TCP)
 
 /*
  * Control requests (netif_ctrl_request_t)