Use log_info() throughout

Signed-off-by: Jens Axboe <jens.axboe@oracle.com>
diff --git a/memory.c b/memory.c
index d9cfe9b..9df2321 100644
--- a/memory.c
+++ b/memory.c
@@ -34,7 +34,7 @@
 	if (phys_mem) {
 		if ((mlock_size + 128 * 1024 * 1024) > phys_mem) {
 			mlock_size = phys_mem - 128 * 1024 * 1024;
-			fprintf(f_out, "fio: limiting mlocked memory to %lluMiB\n", mlock_size >> 20);
+			log_info("fio: limiting mlocked memory to %lluMiB\n", mlock_size >> 20);
 		}
 	}