add null pointer check for vs

[cleverhu]

Thank you for contributing to Velero!

Please add a summary of your change

Add null pointer check for vs.

Does your change fix a particular issue?

Fixes #5438

Please indicate you've done the following:

• Accepted the DCO. Commits without the DCO will delay acceptance.
• Created a changelog file or added /kind changelog-not-required as a comment on this pull request.
• Updated the corresponding documentation in site/content/docs/main.

[draghuram]

Change looks good but while you are modifying the function, the log line at https://github.com/vmware-tanzu/velero/blob/main/pkg/controller/backup_controller.go#L997 seems incorrect.

logger.Debugf("Deleting VolumeSnapshotContent %s", vsc.Name)

The following line actually deletes the volume snapshot, not volume snapshot content. Perhaps the message can be fixed in this PR?

[cleverhu]

Change looks good but while you are modifying the function, the log line at https://github.com/vmware-tanzu/velero/blob/main/pkg/controller/backup_controller.go#L997 seems incorrect.

logger.Debugf("Deleting VolumeSnapshotContent %s", vsc.Name)

The following line actually deletes the volume snapshot, not volume snapshot content. Perhaps the message can be fixed in this PR?

Ok，I will update the code.

[draghuram]

@cleverhu Can you please resolve the conflicts?

Can the PR be merged once conflicts are resolved? We are seeing the same crash reported from our users as well (cloudcasa.io).

[cleverhu]

@cleverhu Can you please resolve the conflicts?

Can the PR be merged once conflicts are resolved? We are seeing the same crash reported from our users as well (cloudcasa.io).

Ok，I will do it.Thanks

[blackpiglet]

#5388
This PR already contains the fix.

[cleverhu]

#5388 This PR already contains the fix.

It seems better, the pr fix a comment for it.

[blackpiglet]

Since #5388 is merged, close this one for now. Feel free to reopen to address things not covered.