[skininfo] fix uninitialized members in CSkinsInfo constructor

Fixes coverity CID 719106
[pvr] fix possible resource leak in channels osd dialog

Fixes coverity CID 1223318
[pvr] fix uninitialized members in CPVRGUIInfo constructor

Fixes coverity CID 1228840
[settings] fix possible null ptr dereference in CGUIDialogSettingsBase::SetupControls

Fixes coverity CID 1215664
[paplayer] fix possible resource leak in QueueNextFileEx

Fixes coverity CID 1126041
[cpuinfo] fix possible divide-by-zero

Fixes coverity CID 1238515
[nfsfile] fix arg type mismatch

Fixes coverity CID 1250595
[rendermanager] fix possible null ptr dereference in CXBMCRenderManager::GetOptimalBufferSize()

Fixes coverity CID 1243594
[vaapi] fix missing break in switch
Merge pull request #5667 from mkortstiege/coverity

coverity fixes