i2c/scx200_acb: Provide more information on bus errors

Upon a bus error, it's rather hard to guess what happened. Dumping the
address, length and status provides a lot of value for troubleshooting
issues.
Signed-off-by: NWilly Tarreau <wtarreau@exceliance.fr>
Signed-off-by: NJean Delvare <khali@linux-fr.org>

drivers/i2c/busses/scx200_acb.c

@@ -217,8 +217,10 @@ static void scx200_acb_machine(struct scx200_acb_iface *iface, u8 status)
 	return;
 
  error:
-	dev_err(&iface->adapter.dev, "%s in state %s\n", errmsg,
-		scx200_acb_state_name[iface->state]);
+	dev_err(&iface->adapter.dev,
+		"%s in state %s (addr=0x%02x, len=%d, status=0x%02x)\n", errmsg,
+		scx200_acb_state_name[iface->state], iface->address_byte,
+		iface->len, status);
 
 	iface->state = state_idle;
 	iface->result = -EIO;