Return correct exit status from daily/zrepl

From `periodic(8)`:

     1     The script has produced some notable information in its output.
           The ⟨basedir⟩_show_info variable controls the masking of this
           output.

dist/freebsd/etc/periodic/daily/zrepl

@@ -11,6 +11,7 @@ fi
 : "${daily_zrepl_crit=1h}"
 zrepl="/usr/local/bin/zrepl"
 
+rc=1
 case "$daily_zrepl_enable" in
     [Yy][Ee][Ss])
 	      if service zrepl enabled; then
@@ -22,6 +23,4 @@ case "$daily_zrepl_enable" in
 	      ;;
 esac
 
-# assigned in periodic.conf
-# shellcheck disable=SC2086,SC2154
-exit $rc
+exit "$rc"