user32/dialog.c: GetNextDlgTabItem returns hwndDlg if it does not contain controls. [try 2]

[Mikhail Maroukhine]

GetNextDlgTabItem returns hwndDlg if it does not contain controls and  
searching next item.
GetNextDlgTabItem returns the first child if next TABSTOP control not  
found.

And returns 0 in both cases if searching prev item

Mikhail
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