Really fix IOPS logging

Commit 9602d8df had a bug where it mistakenly stored
the bytes last seen when doing an IOPS log entry, instead
of the blocks last seen.

Reported-by: Bill Hooper <whooper@micron.com>
Signed-off-by: Jens Axboe <axboe@kernel.dk>
diff --git a/stat.c b/stat.c
index a02c582..fa9af7c 100644
--- a/stat.c
+++ b/stat.c
@@ -1343,7 +1343,7 @@
 		if (td->iops_log)
 			add_log_sample(td, td->iops_log, iops, ddir, 0);
 
-		td->stat_io_bytes[ddir] = td->this_io_bytes[ddir];
+		td->stat_io_blocks[ddir] = td->this_io_blocks[ddir];
 	}
 
 	fio_gettime(&td->iops_sample_time, NULL);