Corrected initialization of configure option --enable-dvd-obs-64k

configure.ac

@@ -202,7 +202,7 @@ CFLAGS="$CFLAGS $LIBBURN_O_DIRECT_DEF"
 dnl ts A91116
 AC_ARG_ENABLE(dvd-obs-64k,
 [  --enable-dvd-obs-64k         64 KB default size for DVD/BD writing, default=no],
-               , enable_fifo_odirect=no)
+               , enable_dvd_obs_64k=no)
 if test x$enable_dvd_obs_64k = xyes; then
     LIBBURN_DVD_OBS_64K="-DLibburn_dvd_obs_default_64K"
     echo "enabled  write size default 64 KB on DVD and BD"