Do not warn when rsync exits with status 0.

handlers/rsync.in

@@ -1103,6 +1103,9 @@ function check_rsync_exit_status {
   fi
 
   case $1 in
+    0)
+       return
+       ;;
     1|2|3|4|5|6|10|11|12|13|14|21)
        fatal "Rsync error $1 when trying to transfer $SECTION"
        ;;