Fix for VirtualBox checks: add VariantInit(&vtProp) to ensure safe VARIANT initialization

[IgorKorkin]

• Applied fix in funcs: vbox_pnpentity_vboxname_wmi and vbox_pnpentity_controllers_wmi
• Added VariantInit(&vtProp) before each property fetch to ensure safe initialization
• Simplified loop termination and property-checking logic

Without this fix, tests occasionally triggered WerFault errors due to uninitialized VARIANT usage

• Applied code style formatting
• Minor fixes in Generic.cpp to avoid build warnings

[ayoubfaouzi]

Awesome catch ! Thanks for the PR.

I will make some pre-commit-hook and github-action to check for code style/formatting this week end.