Make it obvious -roll number is optional

Manual page were updated to indicate it, but rndc -h still displays it
as required parameter. Make it look like optional.

diff --git a/bin/rndc/rndc.c b/bin/rndc/rndc.c
index 088cfd1a17e02bf0ea341b55be5b0dcacfde90f3..346c06e4b60f6f4bbff4cae54d61c231081917f0 100644 (file)
--- a/bin/rndc/rndc.c
+++ b/bin/rndc/rndc.c
@@ -121,7 +121,7 @@ command is one of the following:\n\
                Requires the zone to have a dnssec-policy.\n\
   dnstap -reopen\n\
                Close, truncate and re-open the DNSTAP output file.\n\
-  dnstap -roll count\n\
+  dnstap -roll [count]\n\
                Close, rename and re-open the DNSTAP output file(s).\n\
   dumpdb [-all|-cache|-zones|-adb|-bad|-expired|-fail] [view ...]\n\
                Dump cache(s) to the dump file (named_dump.db).\n\