taglib: fix stupid typo (thanks to Sébastien Escudier)

modules/meta_engine/taglib.cpp

@@ -132,7 +132,7 @@ static void ReadMetaFromId3v2( ID3v2::Tag* tag, demux_t* p_demux, demux_meta_t*
              * terminated string */
             char psz_ufid[64];
             int max_size = __MIN( p_ufid->identifier().size(), 63);
-            strncmp( psz_ufid, p_ufid->identifier().data(), max_size );
+            strncpy( psz_ufid, p_ufid->identifier().data(), max_size );
             psz_ufid[max_size] = '\0';
             vlc_meta_SetTrackID( p_meta, psz_ufid );
         }