Coverity scan fixes

[nyalldawson]

Misc fixes from latest coverity scan results

[github-actions]

🪟 Windows builds

Download Windows builds of this PR for testing.
Debug symbols for this build are available here.
(Built from commit 9b20edd)

🪟 Windows Qt6 builds

Download Windows Qt6 builds of this PR for testing.
(Built from commit 9b20edd)

[qgis-bot]

The backport to release-3_40 failed:

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

stderr

error: could not apply 9b20edd3383... Add missing reference
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

[backport-60311-to-release-3_40 4dbfc479263] Fix leak in zip utils
 Author: Nyall Dawson <[email protected]>
 Date: Tue Jan 28 14:07:57 2025 +1000
 1 file changed, 3 insertions(+)
Auto-merging src/analysis/processing/qgsalgorithmexportmesh.cpp
[backport-60311-to-release-3_40 0ef78737cb1] Validate inputs for export mesh algorithms
 Author: Nyall Dawson <[email protected]>
 Date: Tue Jan 28 14:27:03 2025 +1000
 1 file changed, 12 insertions(+), 2 deletions(-)
[backport-60311-to-release-3_40 e538db511fe] Avoid potential divide by 0 in layout map items
 Author: Nyall Dawson <[email protected]>
 Date: Tue Jan 28 14:27:29 2025 +1000
 1 file changed, 20 insertions(+), 9 deletions(-)
Auto-merging src/core/geometry/qgsinternalgeometryengine.cpp
[backport-60311-to-release-3_40 454499d34c7] Avoid potential divide by zero
 Author: Nyall Dawson <[email protected]>
 Date: Tue Jan 28 14:27:55 2025 +1000
 1 file changed, 2 insertions(+), 2 deletions(-)
Auto-merging src/gui/vector/qgsattributesformproperties.cpp
CONFLICT (content): Merge conflict in src/gui/vector/qgsattributesformproperties.cpp
Auto-merging src/gui/vector/qgsattributesformproperties.h
CONFLICT (content): Merge conflict in src/gui/vector/qgsattributesformproperties.h

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-60311-to-release-3_40
# Cherry-pick the merged commit of this pull request and resolve the conflicts
git cherry-pick 408fe8e6312aa565c4ff6b2ffafc24dcc0f78a8e,1192f8785b075d3825ff0b47ec84b58fb508c7db,ac08627bfed1d189ba160d9ccc77d16858c6ec68,203a253f0e37d6d3454ec6898cee034525a33bc6,9b20edd3383839116b50b0e18b2bc2b922ea1d6c
# Push it to GitHub
git push --set-upstream origin backport-60311-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-60311-to-release-3_40.