fix for 0006722: Remaining mysqli_ install problems (ref. 0006672): mysqli_real_escape_string() expects parameter 1 to be link

git-svn-id: http://mantisbt.svn.sourceforge.net/svnroot/mantisbt/trunk@3990 <a class="text" href="/?p=mantisbt.git;a=object;h=f5dc347c">f5dc347c</a>-c33d-0410-90a0-b07cc1902cb9