avfilter/vf_yadif: fix extra leading dup frame when deint=1

Logic for handling single frame in yadif (0f9f24c9), caused deint=1 (e.g., yadif=0:-1:1) to output extra duplicate leading frame:

ffmpeg -i fate-suite/ffmpeg-synthetic/vsynth1/%02d.pgm  -vf yadif=0:-1:1,showinfo -f null -y /dev/null
 [Parsed_showinfo_1 @ 0x1d967d0] n:0 pts:0 pts_time:0 pos:-1 fmt:gray sar:0/1 s:352x432 i:P iskey:1 type:I checksum:E457EEA0 plane_checksum:[E457EEA0] mean:[126] stdev:[46.6]
 [Parsed_showinfo_1 @ 0x1d967d0] n:1 pts:0 pts_time:0 pos:-1 fmt:gray sar:0/1 s:352x432 i:P iskey:1 type:I checksum:E457EEA0 plane_checksum:[E457EEA0] mean:[126] stdev:[46.6]
(Outputs 51 frames)

After patch, vf "yadif=0:-1:1" behaves correctly (like "yadif=0:-1:0") and outputs 50 frames, first two:

[Parsed_showinfo_1 @ 0x1e307d0] n:0 pts:0 pts_time:0 pos:-1 fmt:gray sar:0/1 s:352x432 i:P iskey:1 type:I checksum:68E8D1EB plane_checksum:[68E8D1EB] mean:[126] stdev:[46.0]
[Parsed_showinfo_1 @ 0x1e307d0] n:1 pts:2 pts_time:0.04 pos:-1 fmt:gray sar:0/1 s:352x432 i:P iskey:1 type:I checksum:4E674BC7 plane_checksum:[4E674BC7] mean:[125] stdev:[46.0]
(Outputs 50 frames)
Signed-off-by: Neil Birkbeck <neil.birkbeck@gmail.com>
Signed-off-by: Michael Niedermayer <michaelni@gmx.at>

libavfilter/vf_yadif.c

@@ -342,6 +342,9 @@ static int filter_frame(AVFilterLink *link, AVFrame *frame)
         return -1;
     }
 
+    if (!yadif->prev)
+        return 0;
+
     if ((yadif->deint && !yadif->cur->interlaced_frame) || ctx->is_disabled) {
         yadif->out  = av_frame_clone(yadif->cur);
         if (!yadif->out)
@@ -353,9 +356,6 @@ static int filter_frame(AVFilterLink *link, AVFrame *frame)
         return ff_filter_frame(ctx->outputs[0], yadif->out);
     }
 
-    if (!yadif->prev)
-        return 0;
-
     yadif->out = ff_get_video_buffer(ctx->outputs[0], link->w, link->h);
     if (!yadif->out)
         return AVERROR(ENOMEM);