slightly less basic shellcheck fixes

scripts/tools/release.sh

@@ -57,7 +57,7 @@ shortlog="
 
 ## [${version}] - $(date +'%Y-%m-%d')
 
-$(git shortlog -e ${last_release}..HEAD)
+$(git shortlog -e "${last_release}"..HEAD)
 "
 echo "${shortlog}"
 
@@ -95,11 +95,11 @@ outfile="${tempdir}/${tarprefix}.tar"
 git archive "--output=${outfile}" "--prefix=${tarprefix}/" HEAD
 # Append submodule archives
 git submodule foreach --recursive "git archive --output ${tempdir}/${tarprefix}-sub-\${sha1}.tar --prefix=${tarprefix}/\${sm_path}/ HEAD"
-if [[ $(ls ${tempdir}/${tarprefix}-sub*.tar | wc -l) != 0  ]]; then
+if [[ $(ls "${tempdir}/${tarprefix}"-sub*.tar | wc -l) != 0  ]]; then
   # combine all archives into one tar
   tar --concatenate --file "${outfile}" "${tempdir}/${tarprefix}"-sub*.tar
 fi
-echo "Created tape archive '${outfile}' of size $(du -h ${outfile})."
+echo "Created tape archive ${outfile} of size $(du -h "${outfile}")."
 
 # 6. compress
 echo  "compressing:"