fix warning: guihtml/src/TGHtmlIndex.cxx: In member function 'int TGHtml::IndexMod(TGHtmlElement**, int*, char*)': guihtml/src/TGHtmlIndex.cxx:261: warning: operation on 'i' may be undefined
fix warning:
guihtml/src/TGHtmlIndex.cxx: In member function 'int TGHtml::IndexMod(TGHtmlElement**, int*, char*)':
guihtml/src/TGHtmlIndex.cxx:261: warning: operation on 'i' may be undefined


git-svn-id: acec3fd5b7ea1eb9e79d6329d318e8118ee2e14f@18826 27541ba8-7e3a-0410-8455-c3a389f83636

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