tools: remove last of error-masking in commit-queue.sh

Remove the lats of the unintentional error-masking in commit-queue.sh.

With this change, `tools/lint-sh.js . --from-npx` at last passes.

PR-URL: nodejs#41356
Reviewed-By: Luigi Pinca <luigipinca@gmail.com>
Reviewed-By: Tierney Cyren <hello@bnb.im>
Reviewed-By: Zijian Liu <lxxyxzj@gmail.com>
Reviewed-By: Tobias Nießen <tniessen@tnie.de>

tools/actions/commit-queue.sh

@@ -83,10 +83,14 @@ for pr in "$@"; do
   else
     # If there's only one commit, we can use the Squash and Merge feature from GitHub.
     # TODO: use `gh pr merge` when the GitHub CLI allows to customize the commit title (https://github.com/cli/cli/issues/1023).
+    commit_title=$(git log -1 --pretty='format:%s')
+    commit_body=$(git log -1 --pretty='format:%b')
+    commit_head=$(grep 'Fetched commits as' output | cut -d. -f3 | xargs git rev-parse)
+
     jq -n \
-      --arg title "$(git log -1 --pretty='format:%s')" \
-      --arg body "$(git log -1 --pretty='format:%b')" \
-      --arg head "$(grep 'Fetched commits as' output | cut -d. -f3 | xargs git rev-parse)" \
+      --arg title "${commit_title}" \
+      --arg body "${commit_body}" \
+      --arg head "${commit_head}" \
       '{merge_method:"squash",commit_title:$title,commit_message:$body,sha:$head}' > output.json
     cat output.json
     if ! gh api -X PUT "repos/${OWNER}/${REPOSITORY}/pulls/${pr}/merge" --input output.json > output; then