Fix name of the slat log file

Currently the slat and clat logs go to the same clat log file when the
latency log file is specified.

Signed-off-by: Jens Axboe <jens.axboe@oracle.com>
diff --git a/fio.c b/fio.c
index ad2282d..ff77c91 100644
--- a/fio.c
+++ b/fio.c
@@ -1086,7 +1086,7 @@
 	if (td->ts.slat_log) {
 		if (td->o.lat_log_file) {
 			finish_log_named(td, td->ts.slat_log,
-						td->o.lat_log_file, "clat");
+						td->o.lat_log_file, "slat");
 		} else
 			finish_log(td, td->ts.slat_log, "slat");
 	}