fix: send all output to null, not just errors

Author: fcastilloec

set_port.sh

@@ -5,7 +5,7 @@ trap 'exit 0' SIGTERM
 readonly root_dir="/home/felipe/workspace/containers/pia-transmission-prowlarr"
 readonly transmission_port="${root_dir}/data/pia-port/port.dat"
 
-if ! transmission-remote -l 2>/dev/null; then # Checks that Transmission is running
+if ! transmission-remote -l >/dev/null 2>&1; then # Checks that Transmission is running
   >&2 echo "Transmission not running."; exit 1
 fi