vf_stereo3d: Add AVOption table terminator

Signed-off-by: Michael Niedermayer <michaelni@gmx.at>

libavfilter/vf_stereo3d.c

@@ -173,6 +173,7 @@ static const AVOption stereo3d_options[] = {
     { "sbs2r", "side by side half width right first", 0, AV_OPT_TYPE_CONST, {.i64=SIDE_BY_SIDE_2_RL},  0, 0, FLAGS, "out" },
     { "sbsl",  "side by side left first",             0, AV_OPT_TYPE_CONST, {.i64=SIDE_BY_SIDE_LR},    0, 0, FLAGS, "out" },
     { "sbsr",  "side by side right first",            0, AV_OPT_TYPE_CONST, {.i64=SIDE_BY_SIDE_RL},    0, 0, FLAGS, "out" },
+    {NULL},
 };
 
 AVFILTER_DEFINE_CLASS(stereo3d);