[IPv6] SNMP: Restore Udp6InErrors incrementation

As the checksum verification is postponed till user calls recv or poll,
the inrementation of Udp6InErrors counter should be also postponed.
Currently, it is postponed in non-blocking operation case. However it
should be postponed in all case like the IPv4 code.
Signed-off-by: NMitsuru Chinen <mitch@linux.vnet.ibm.com>
Acked-by: NHerbert Xu <herbert@gondor.apana.org.au>
Signed-off-by: NDavid S. Miller <davem@davemloft.net>

net/ipv6/udp.c

@@ -205,12 +205,11 @@ int udpv6_recvmsg(struct kiocb *iocb, struct sock *sk,
 	return err;
 
 csum_copy_err:
+	UDP6_INC_STATS_USER(UDP_MIB_INERRORS, is_udplite);
 	skb_kill_datagram(sk, skb, flags);
 
-	if (flags & MSG_DONTWAIT) {
-		UDP6_INC_STATS_USER(UDP_MIB_INERRORS, is_udplite);
+	if (flags & MSG_DONTWAIT)
 		return -EAGAIN;
-	}
 	goto try_again;
 }