match prior rm usage w/test and rm instead of rm -f

handlers/sys.in

@@ -600,7 +600,9 @@ if [ "$luksheaders" == "yes" ]; then
          label=${dev#/dev/}
          label=${label//\//-}
          outputfile=${luksheadersfile//__star__/$label}
-         rm -f "${outputfile}"
+         if [ -f "${outputfile}" ]; then
+           rm "${outputfile}"
+         fi
          debug "$CRYPTSETUP will try to backup the LUKS header for device $dev"
          debug "$CRYPTSETUP luksHeaderBackup \"${dev}\" --header-backup-file \"${outputfile}\""
          output=`$CRYPTSETUP luksHeaderBackup "${dev}" --header-backup-file "${outputfile}" 2>&1`