[fix] coverity issues

[Rechi]

Description

Fix a few coverity issues

Motivation and Context

reduce coverity issues

How Has This Been Tested?

build for windows and osx

Types of change

• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to change)

Checklist:

• My code follows the Code guidelines of this project
• My change requires a change to the documentation, either Doxygen or wiki
• I have updated the documentation accordingly
• I have read the CONTRIBUTING document
• I have added tests to cover my change
• All new and existing tests passed

[Rechi]

jenkins build this please

[Rechi]

@Montellese are the web server changes okay?
don't know whom I should ping for the other changes

[Montellese]

@Rechi: webserver changes look ok. I'm actually confused because I did those changes during my last webserver cleanup as well but I had to do quite a few rebases there so maybe I lost that commit (and hopefully only that one).

[Rechi]

any objections?