max_globe_history: slightly cleanup bash loop

rootfs/etc/s6-overlay/scripts/cleanup_globe_history

@@ -31,12 +31,14 @@ fi
 cutoffepoch="$(date -d"-${MAX_GLOBE_HISTORY} days" +%s)"
 
 "${s6wrap[@]}" echo "Purging globe_history older than $MAX_GLOBE_HISTORY days (before $(date -d"-${MAX_GLOBE_HISTORY} days" +%d-%b-%Y))"
-for dir in $(find /var/globe_history -maxdepth 3 -mindepth 3 -type d | grep -o -E -e '[0-9]{4}/[0-9]{2}/[0-9]{2}$'); do
-    if (( $(date -d "$dir" +%s) < cutoffepoch )); then
-        "${s6wrap[@]}" echo Removing "/var/globe_history/$dir"
-        rm -rf "/var/globe_history/$dir"
-    fi
-done
+
+find /var/globe_history -maxdepth 3 -mindepth 3 -type d | grep -o -E -e '[0-9]{4}/[0-9]{2}/[0-9]{2}$' | \
+    while read dir; do
+        if (( $(date -d "$dir" +%s) < cutoffepoch )); then
+            "${s6wrap[@]}" echo Removing "/var/globe_history/$dir"
+            rm -rf "/var/globe_history/$dir"
+        fi
+    done
 
 # delete empty year / month directories
 # make sure the directories haven't been touched for 3 days so freshly created directories aren't removed