fixed: ticket xbmc#10148 - a m3u playlist can contain video files. ne…

…ed to check before we set audio duration on items. thanks to Gwan

(cherry picked from commit 702c210bbd847c7c08a532ceeed95d86c35a6419)

git-svn-id: https://xbmc.svn.sourceforge.net/svnroot/xbmc/branches/Dharma@33725 568bbfeb-2a22-0410-94d2-cc84cf5bfa90

xbmc/PlayListM3U.cpp

@@ -123,7 +123,7 @@ bool CPlayListM3U::Load(const CStdString& strFileName)
         CUtil::GetQualifiedFilename(m_strBasePath, strFileName);
         CFileItemPtr newItem(new CFileItem(strInfo));
         newItem->m_strPath = strFileName;
-        if (lDuration)
+        if (lDuration && newItem->IsAudio())
           newItem->GetMusicInfoTag()->SetDuration(lDuration);
         Add(newItem);