[UDP]: Restore missing inDatagrams increments

The previous move of the the UDP inDatagrams counter caused the
counting of encapsulated packets, SUNRPC data (as opposed to call)
packets and RXRPC packets to go missing.

This patch restores all of these.

Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
Signed-off-by: David S. Miller <davem@davemloft.net>
diff --git a/net/rxrpc/ar-input.c b/net/rxrpc/ar-input.c
index 91b5bbb..f446d9b 100644
--- a/net/rxrpc/ar-input.c
+++ b/net/rxrpc/ar-input.c
@@ -20,6 +20,7 @@
 #include <net/sock.h>
 #include <net/af_rxrpc.h>
 #include <net/ip.h>
+#include <net/udp.h>
 #include "ar-internal.h"
 
 unsigned long rxrpc_ack_timeout = 1;
@@ -707,10 +708,13 @@
 	if (skb_checksum_complete(skb)) {
 		rxrpc_free_skb(skb);
 		rxrpc_put_local(local);
+		UDP_INC_STATS_BH(UDP_MIB_INERRORS, 0);
 		_leave(" [CSUM failed]");
 		return;
 	}
 
+	UDP_INC_STATS_BH(UDP_MIB_INDATAGRAMS, 0);
+
 	/* the socket buffer we have is owned by UDP, with UDP's data all over
 	 * it, but we really want our own */
 	skb_orphan(skb);