targa: stop using deprecated avcodec_set_dimensions

libavcodec/targa.c

@@ -142,10 +142,9 @@ static int decode_frame(AVCodecContext *avctx,
         return AVERROR_INVALIDDATA;
     }
 
-    if ((ret = av_image_check_size(w, h, 0, avctx)) < 0)
+    if ((ret = ff_set_dimensions(avctx, w, h)) < 0)
         return ret;
-    if(w != avctx->width || h != avctx->height)
-        avcodec_set_dimensions(avctx, w, h);
+
     if ((ret = ff_get_buffer(avctx, p, 0)) < 0){
         av_log(avctx, AV_LOG_ERROR, "get_buffer() failed\n");
         return ret;