Fix leak in help plugin.
Fix leak in help plugin.

Reviewed-by: kh1

sandsmark/qtcreator-minimap,renatofilho/QtCreator,sandsmark/qtcreator-minimap,KDE/android-qt-creator,kuba1/qtcreator,xianian/qt-creator,farseerri/git_code,darksylinc/qt-creator,KDE/android-qt-creator,bakaiadam/collaborative_qt_creator,maui-packages/qt-creator,renatofilho/QtCreator,maui-packages/qt-creator,xianian/qt-creator,colede/qtcreator,omniacreator/qtcreator,hdweiss/qt-creator-visualizer,KDAB/KDAB-Creator,Distrotech/qtcreator,dmik/qt-creator-os2,darksylinc/qt-creator,kuba1/qtcreator,farseerri/git_code,omniacreator/qtcreator,Distrotech/qtcreator,syntheticpp/qt-creator,sandsmark/qtcreator-minimap,amyvmiwei/qt-creator,amyvmiwei/qt-creator,AltarBeastiful/qt-creator,richardmg/qtcreator,kuba1/qtcreator,richardmg/qtcreator,pcacjr/qt-creator,amyvmiwei/qt-creator,xianian/qt-creator,malikcjm/qtcreator,KDE/android-qt-creator,bakaiadam/collaborative_qt_creator,danimo/qt-creator,kuba1/qtcreator,syntheticpp/qt-creator,richardmg/qtcreator,yinyunqiao/qtcreator,omniacreator/qtcreator,pcacjr/qt-creator,jonnor/qt-creator,bakaiadam/collaborative_qt_creator,azat/qtcreator,duythanhphan/qt-creator,sandsmark/qtcreator-minimap,farseerri/git_code,Distrotech/qtcreator,darksylinc/qt-creator,colede/qtcreator,amyvmiwei/qt-creator,amyvmiwei/qt-creator,xianian/qt-creator,darksylinc/qt-creator,colede/qtcreator,Distrotech/qtcreator,hdweiss/qt-creator-visualizer,amyvmiwei/qt-creator,renatofilho/QtCreator,AltarBeastiful/qt-creator,maui-packages/qt-creator,AltarBeastiful/qt-creator,dmik/qt-creator-os2,pcacjr/qt-creator,kuba1/qtcreator,martyone/sailfish-qtcreator,dmik/qt-creator-os2,maui-packages/qt-creator,syntheticpp/qt-creator,malikcjm/qtcreator,ostash/qt-creator-i18n-uk,azat/qtcreator,jonnor/qt-creator,dmik/qt-creator-os2,xianian/qt-creator,danimo/qt-creator,ostash/qt-creator-i18n-uk,Distrotech/qtcreator,darksylinc/qt-creator,hdweiss/qt-creator-visualizer,martyone/sailfish-qtcreator,richardmg/qtcreator,danimo/qt-creator,jonnor/qt-creator,yinyunqiao/qtcreator,pcacjr/qt-creator,colede/qtcreator,azat/qtcreator,KDAB/KDAB-Creator,kuba1/qtcreator,farseerri/git_code,AltarBeastiful/qt-creator,martyone/sailfish-qtcreator,xianian/qt-creator,jonnor/qt-creator,renatofilho/QtCreator,danimo/qt-creator,kuba1/qtcreator,malikcjm/qtcreator,duythanhphan/qt-creator,danimo/qt-creator,martyone/sailfish-qtcreator,sandsmark/qtcreator-minimap,colede/qtcreator,renatofilho/QtCreator,AltarBeastiful/qt-creator,richardmg/qtcreator,renatofilho/QtCreator,danimo/qt-creator,martyone/sailfish-qtcreator,maui-packages/qt-creator,danimo/qt-creator,kuba1/qtcreator,danimo/qt-creator,hdweiss/qt-creator-visualizer,richardmg/qtcreator,amyvmiwei/qt-creator,KDAB/KDAB-Creator,ostash/qt-creator-i18n-uk,danimo/qt-creator,azat/qtcreator,amyvmiwei/qt-creator,dmik/qt-creator-os2,syntheticpp/qt-creator,duythanhphan/qt-creator,richardmg/qtcreator,colede/qtcreator,dmik/qt-creator-os2,martyone/sailfish-qtcreator,bakaiadam/collaborative_qt_creator,omniacreator/qtcreator,sandsmark/qtcreator-minimap,ostash/qt-creator-i18n-uk,pcacjr/qt-creator,darksylinc/qt-creator,malikcjm/qtcreator,duythanhphan/qt-creator,bakaiadam/collaborative_qt_creator,omniacreator/qtcreator,KDAB/KDAB-Creator,pcacjr/qt-creator,syntheticpp/qt-creator,KDE/android-qt-creator,kuba1/qtcreator,KDAB/KDAB-Creator,dmik/qt-creator-os2,xianian/qt-creator,hdweiss/qt-creator-visualizer,martyone/sailfish-qtcreator,duythanhphan/qt-creator,KDAB/KDAB-Creator,yinyunqiao/qtcreator,duythanhphan/qt-creator,azat/qtcreator,farseerri/git_code,maui-packages/qt-creator,syntheticpp/qt-creator,darksylinc/qt-creator,yinyunqiao/qtcreator,KDE/android-qt-creator,AltarBeastiful/qt-creator,yinyunqiao/qtcreator,Distrotech/qtcreator,maui-packages/qt-creator,bakaiadam/collaborative_qt_creator,bakaiadam/collaborative_qt_creator,hdweiss/qt-creator-visualizer,xianian/qt-creator,martyone/sailfish-qtcreator,darksylinc/qt-creator,martyone/sailfish-qtcreator,jonnor/qt-creator,ostash/qt-creator-i18n-uk,ostash/qt-creator-i18n-uk,ostash/qt-creator-i18n-uk,jonnor/qt-creator,malikcjm/qtcreator,KDE/android-qt-creator,farseerri/git_code,omniacreator/qtcreator,farseerri/git_code,malikcjm/qtcreator,azat/qtcreator,syntheticpp/qt-creator,AltarBeastiful/qt-creator,Distrotech/qtcreator,colede/qtcreator,pcacjr/qt-creator,KDE/android-qt-creator,KDE/android-qt-creator,omniacreator/qtcreator,yinyunqiao/qtcreator,malikcjm/qtcreator,farseerri/git_code,yinyunqiao/qtcreator,xianian/qt-creator,AltarBeastiful/qt-creator,duythanhphan/qt-creator