Use log_info() more consistently

Signed-off-by: Jens Axboe <jens.axboe@oracle.com>
diff --git a/stat.c b/stat.c
index 6418cf1..9d1f66a 100644
--- a/stat.c
+++ b/stat.c
@@ -644,7 +644,7 @@
 	 * don't overwrite last signal output
 	 */
 	if (!terse_output)
-		printf("\n");
+		log_info("\n");
 
 	for (i = 0; i < nr_ts; i++) {
 		ts = &threadstats[i];