refactor(chronyc): use _comp_split

Author: akinomyoga

completions/chronyc

@@ -3,8 +3,8 @@
 _comp_cmd_chronyc__command_args()
 {
     local -a args
-    args=($(compgen -W "$("$1" help 2>/dev/null |
-        awk '/^'"$prev"'\s[^ []/ { gsub("\\|", " ", $2); print $2 }')"))
+    _comp_split args "$("$1" help 2>/dev/null |
+        awk '/^'"$prev"'\s[^ []/ { gsub("\\|", " ", $2); print $2 }')"
     case $args in
         \<address\>) _known_hosts_real -- "$cur" ;;
         \<*) ;;