libbb: introduce and use sleep1()

function                                             old     new   delta
sleep1                                                 -       9      +9
run_shutdown_and_kill_processes                       97      95      -2
restore_state_and_exit                               116     114      -2
reread_partition_table                                67      65      -2
flush_buffer_cache                                    80      78      -2
chat_main                                           1302    1300      -2
timeout_main                                         310     307      -3
telnet_main                                         1235    1232      -3
stop_handler                                          86      83      -3
process_action                                      1078    1075      -3
nbdclient_main                                      1185    1182      -3
init_main                                            789     786      -3
getty_main                                          1541    1538      -3
do_time                                              410     407      -3
runsv_main                                          1682    1677      -5
pause_and_low_level_reboot                            59      54      -5
inetd_main                                          1917    1911      -6
------------------------------------------------------------------------------
(add/remove: 1/0 grow/shrink: 0/16 up/down: 9/-50)            Total: -41 bytes

Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>
diff --git a/runit/runsv.c b/runit/runsv.c
index 36d8510..7e22862 100644
--- a/runit/runsv.c
+++ b/runit/runsv.c
@@ -651,7 +651,7 @@
 				gettimeofday_ns(&svd[0].start);
 				update_status(&svd[0]);
 				if (LESS(svd[0].start.tv_sec, deadline))
-					sleep(1);
+					sleep1();
 			}
 			if (haslog) {
 				if (child == svd[1].pid) {
@@ -664,7 +664,7 @@
 					gettimeofday_ns(&svd[1].start);
 					update_status(&svd[1]);
 					if (LESS(svd[1].start.tv_sec, deadline))
-						sleep(1);
+						sleep1();
 				}
 			}
 		} /* for (;;) */