libbb: bb_do_delay(3) -> pause_after_failed_login(), and stop looping there

function                                             old     new   delta
pause_after_failed_login                               -       9      +9
vlock_main                                           358     353      -5
sulogin_main                                         252     247      -5
su_main                                              484     479      -5
passwd_main                                          936     931      -5
login_main                                           967     962      -5
bb_do_delay                                           68       -     -68
------------------------------------------------------------------------------
(add/remove: 1/1 grow/shrink: 0/5 up/down: 9/-93)             Total: -84 bytes

Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>
diff --git a/networking/pscan.c b/networking/pscan.c
index 2715ef2..e114e55 100644
--- a/networking/pscan.c
+++ b/networking/pscan.c
@@ -139,7 +139,7 @@
 			 * We check rtt BEFORE we usleep, otherwise
 			 * on localhost we'll have no writes done (!)
 			 * before we exceed (rather small) rtt */
-			usleep(rtt_4/8);
+			usleep(rtt_4 / 8);
  open:
 			diff = MONOTONIC_US() - start;
 			DMSG("write to port %u @%u", port, diff - start);