save the file check every time

.local/bin/statusbar/nettraf

@@ -11,10 +11,9 @@ case "$BLOCK_BUTTON" in
 esac
 
 logfile="${XDG_CACHE_HOME:-$HOME/.cache}/netlog"
-prevdata="$(cat "$logfile")"
+prevdata="$(cat "$logfile")" || echo "0 0" > "$logfile"
 
 rxcurrent="$(($(paste -d '+' /sys/class/net/[ew]*/statistics/rx_bytes)))"
-[ -f "$logfile" ] || echo "0 0" > "$logfile"
 txcurrent="$(($(paste -d '+' /sys/class/net/[^lo]*/statistics/tx_bytes)))"
 
 printf "🔻%sKiB 🔺%sKiB\\n" \