Make sure polkit.service exists

Signed-off-by: Dylan Aïssi <dylan.aissi@collabora.com>

common/polkit-parsing.sh

@@ -32,6 +32,10 @@ else
 	exit 1
 fi
 
+# Make sure polkit.service exists since it was renamed in the past without
+# having changed in the cleanup step.
+systemctl list-unit-files polkit.service
+
 ( set +e; sudo ${polkitd} --replace 2>&1 ) | sed 's/^/# /' | tee $TMPFILE &
 
 # Wait for it to start.