ipsec: update MAX_AH_AUTH_LEN to support sha512

icv_truncbits is set to 256 for sha512, so update
MAX_AH_AUTH_LEN to 64.
Signed-off-by: NNicolas Dichtel <nicolas.dichtel@6wind.com>
Signed-off-by: NDavid S. Miller <davem@davemloft.net>

include/net/ah.h

@@ -4,7 +4,7 @@
 #include <linux/skbuff.h>
 
 /* This is the maximum truncated ICV length that we know of. */
-#define MAX_AH_AUTH_LEN	16
+#define MAX_AH_AUTH_LEN	64
 
 struct crypto_ahash;