avcodec/c93: stop using deprecated avcodec_set_dimensions

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

libavcodec/c93.c

@@ -127,7 +127,8 @@ static int decode_frame(AVCodecContext *avctx, void *data,
     uint8_t *out;
     int stride, ret, i, x, y, b, bt = 0;
 
-    avcodec_set_dimensions(avctx, WIDTH, HEIGHT);
+    if ((ret = ff_set_dimensions(avctx, WIDTH, HEIGHT)) < 0)
+        return ret;
 
     c93->currentpic ^= 1;