a64multi: check elbg return values

libavcodec/a64multienc.c

@@ -321,8 +321,14 @@ static int a64multi_encode_frame(AVCodecContext *avctx, AVPacket *pkt,
             buf = pkt->data;
 
             /* calc optimal new charset + charmaps */
-            ff_init_elbg(meta, 32, 1000 * c->mc_lifetime, best_cb, CHARSET_CHARS, 50, charmap, &c->randctx);
+            ret = ff_init_elbg(meta, 32, 1000 * c->mc_lifetime, best_cb,
-            ff_do_elbg  (meta, 32, 1000 * c->mc_lifetime, best_cb, CHARSET_CHARS, 50, charmap, &c->randctx);
+                               CHARSET_CHARS, 50, charmap, &c->randctx);
+            if (ret < 0)
+                return ret;
+            ret = ff_do_elbg(meta, 32, 1000 * c->mc_lifetime, best_cb,
+                             CHARSET_CHARS, 50, charmap, &c->randctx);
+            if (ret < 0)
+                return ret;
 
             /* create colorram map and a c64 readable charset */
             render_charset(avctx, charset, colram);