ntpd: do run the script at leat once in 11 minutes

function                                             old     new   delta
ntpd_main                                           1197    1226     +29

Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>
diff --git a/networking/ntpd.c b/networking/ntpd.c
index 0b60d00..17e5c7d 100644
--- a/networking/ntpd.c
+++ b/networking/ntpd.c
@@ -2362,7 +2362,9 @@
 
 		/* Nothing between here and poll() blocks for any significant time */
 
-		nextaction = G.cur_time + 3600;
+		nextaction = G.last_script_run + (11*60);
+		if (nextaction < G.cur_time + 1)
+			nextaction = G.cur_time + 1;
 
 		i = 0;
 #if ENABLE_FEATURE_NTPD_SERVER