lavfi/fieldorder: use av_image_fill_linesizes()

Signed-off-by: Paul B Mahol <onemda@gmail.com>

libavfilter/vf_fieldorder.c

@@ -70,16 +70,8 @@ static int config_input(AVFilterLink *inlink)
 {
     AVFilterContext   *ctx = inlink->dst;
     FieldOrderContext *s   = ctx->priv;
-    int               plane;
 
-    /** full an array with the number of bytes that the video
-     *  data occupies per line for each plane of the input video */
-    for (plane = 0; plane < 4; plane++) {
-        s->line_size[plane] = av_image_get_linesize(inlink->format, inlink->w,
-                                                    plane);
-    }
-
-    return 0;
+    return av_image_fill_linesizes(s->line_size, inlink->format, inlink->w);
 }
 
 static int filter_frame(AVFilterLink *inlink, AVFrame *frame)