avcodec/nuv: Use ff_set_dimensions()

Fixes: OOM
Fixes: 18956/clusterfuzz-testcase-minimized-ffmpeg_AV_CODEC_ID_NUV_fuzzer-5766505644163072

Found-by: continuous fuzzing process https://github.com/google/oss-fuzz/tree/master/projects/ffmpeg
Reviewed-by: Paul B Mahol <onemda@gmail.com>
Signed-off-by: Michael Niedermayer <michael@niedermayer.cc>
(cherry picked from commit 1ca978d636)
Signed-off-by: Michael Niedermayer <michael@niedermayer.cc>

libavcodec/nuv.c

@@ -128,10 +128,10 @@ static int codec_reinit(AVCodecContext *avctx, int width, int height,
                      + RTJPEG_HEADER_SIZE;
         if (buf_size > INT_MAX/8)
             return -1;
-        if ((ret = av_image_check_size(height, width, 0, avctx)) < 0)
+        if ((ret = ff_set_dimensions(avctx, width, height)) < 0)
             return ret;
-        avctx->width  = c->width  = width;
-        avctx->height = c->height = height;
+        c->width  = width;
+        c->height = height;
         av_fast_malloc(&c->decomp_buf, &c->decomp_size,
                        buf_size);
         if (!c->decomp_buf) {