Coverity fixes

[nyalldawson]

No description provided.

[github-actions]

🪟 Windows builds

Download Windows builds of this PR for testing.
Debug symbols for this build are available here.
(Built from commit e3762c5)

🪟 Windows Qt6 builds

Download Windows Qt6 builds of this PR for testing.
(Built from commit e3762c5)

[qgis-bot]

The backport to release-3_40 failed:

The process '/usr/bin/git' failed with exit code 1

stderr

error: could not apply 73525ed182a... Initialize members
hint: After resolving the conflicts, mark them with
hint: "git add/rm <pathspec>", then run
hint: "git cherry-pick --continue".
hint: You can instead skip this commit with "git cherry-pick --skip".
hint: To abort and get back to the state before "git cherry-pick",
hint: run "git cherry-pick --abort".
hint: Disable this message with "git config set advice.mergeConflict false"

stdout

CONFLICT (modify/delete): src/core/pointcloud/qgspointcloudlayerundocommand.h deleted in HEAD and modified in 73525ed182a (Initialize members).  Version 73525ed182a (Initialize members) of src/core/pointcloud/qgspointcloudlayerundocommand.h left in tree.

To backport manually, run these commands in your terminal:

# Fetch latest updates from GitHub
git fetch
# Create a new working tree
git worktree add .worktrees/backport-release-3_40 release-3_40
# Navigate to the new working tree
cd .worktrees/backport-release-3_40
# Create a new branch
git switch --create backport-60555-to-release-3_40
# Cherry-pick the merged commit of this pull request and resolve the conflicts
git cherry-pick 73525ed182aea6926c6a32a33fb4b091c8cc0331,bcdedb4fcf4387e317d1eb173de8ff6946e48281,8f170a683075285a58aa49956c633221ac56566f,e3762c5f6e46b408f4a06319734bbcb6e4fcf111
# Push it to GitHub
git push --set-upstream origin backport-60555-to-release-3_40
# Go back to the original working tree
cd ../..
# Delete the working tree
git worktree remove .worktrees/backport-release-3_40

Then, create a pull request where the base branch is release-3_40 and the compare/head branch is backport-60555-to-release-3_40.