Get rid of KiB vs KB distinction

Confuses more than it does good, drop it and default to just using KB,
MB, etc.

Signed-off-by: Jens Axboe <jens.axboe@oracle.com>
diff --git a/memory.c b/memory.c
index 00339e4..9b49d39 100644
--- a/memory.c
+++ b/memory.c
@@ -39,7 +39,7 @@
 	if (phys_mem) {
 		if ((mlock_size + 128 * 1024 * 1024) > phys_mem) {
 			mlock_size = phys_mem - 128 * 1024 * 1024;
-			log_info("fio: limiting mlocked memory to %lluMiB\n",
+			log_info("fio: limiting mlocked memory to %lluMB\n",
 							mlock_size >> 20);
 		}
 	}