m68k: Amiga A2065 and Ariadne TX statistics

Add missing code to the Amiga A2065 and Ariadne drivers to update
net_device_stats.tx_bytes.

Signed-off-by: Geert Uytterhoeven <geert@linux-m68k.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
diff --git a/drivers/net/ariadne.c b/drivers/net/ariadne.c
index a0e68e7..a241ae7 100644
--- a/drivers/net/ariadne.c
+++ b/drivers/net/ariadne.c
@@ -677,6 +677,7 @@
 	priv->cur_tx -= TX_RING_SIZE;
 	priv->dirty_tx -= TX_RING_SIZE;
     }
+    priv->stats.tx_bytes += len;
 
     /* Trigger an immediate send poll. */
     lance->RAP = CSR0;		/* PCnet-ISA Controller Status */