Enable Help string scroll when the help info can't show all at current page.

Signed-off-by: Dong Eric <eric.dong@intel.com>
Reviewed-by: Gao Liming <liming.gao@intel.com>

git-svn-id: https://edk2.svn.sourceforge.net/svnroot/edk2/trunk/edk2@13184 6f19259b-4bc3-4df7-8a09-765794883524

MdeModulePkg/Universal/SetupBrowserDxe/ProcessOptions.c

@@ -981,7 +981,7 @@ ProcessOptions (
   @param  RowCount               TRUE: if Question is selected.
 
 **/
-VOID
+UINTN
 ProcessHelpString (
   IN  CHAR16  *StringPtr,
   OUT CHAR16  **FormattedString,
@@ -1182,4 +1182,6 @@ ProcessHelpString (
   }
 
   FreePool (IndexArray);
+
+  return LineCount;
 }