avcodec/vqavideo: Set video size

Fixes: out of array access
Fixes: 15919/clusterfuzz-testcase-minimized-ffmpeg_AV_CODEC_ID_VQA_fuzzer-5657368257363968

Found-by: continuous fuzzing process https://github.com/google/oss-fuzz/tree/master/projects/ffmpegSigned-off-by: Michael Niedermayer <michael@niedermayer.cc>

libavcodec/vqavideo.c

@@ -147,7 +147,7 @@ static av_cold int vqa_decode_init(AVCodecContext *avctx)
     }
     s->width = AV_RL16(&s->avctx->extradata[6]);
     s->height = AV_RL16(&s->avctx->extradata[8]);
-    if ((ret = av_image_check_size(s->width, s->height, 0, avctx)) < 0) {
+    if ((ret = ff_set_dimensions(avctx, s->width, s->height)) < 0) {
         s->width= s->height= 0;
         return ret;
     }