fix global-buffer-overflow found through UI testing on UBSAN jenkins job

Change-Id: Ie4d81561057bb4d67fe050ca7fb82861d5d207a2
Reviewed-on: https://gerrit.libreoffice.org/52587Tested-by: Jenkins <ci@libreoffice.org>
Reviewed-by: Markus Mohrhard <markus.mohrhard@googlemail.com>

sw/source/ui/frmdlg/frmpage.cxx

@@ -783,7 +783,7 @@ void SwFramePage::setOptimalFrameWidth()
         { aHFrameMap, SAL_N_ELEMENTS(aHFrameMap) },
         { aHFlyHtmlMap, SAL_N_ELEMENTS(aHFlyHtmlMap) },
         { aVFrameMap, SAL_N_ELEMENTS(aVFrameMap) },
-        { aVFlyHtmlMap, SAL_N_ELEMENTS(aVFrameMap) },
+        { aVFlyHtmlMap, SAL_N_ELEMENTS(aVFlyHtmlMap) },
         { aHParaMap, SAL_N_ELEMENTS(aHParaMap) },
         { aHParaHtmlMap, SAL_N_ELEMENTS(aHParaHtmlMap) },
         { aHParaHtmlAbsMap, SAL_N_ELEMENTS(aHParaHtmlAbsMap) },