avformat/mux: Check return code of av_packet_split_side_data()

Fixes CID1403225
Signed-off-by: Michael Niedermayer <michael@niedermayer.cc>

libavformat/mux.c

@@ -883,8 +883,11 @@ static int do_packet_auto_bsf(AVFormatContext *s, AVPacket *pkt) {
 
 #if FF_API_LAVF_MERGE_SD
 FF_DISABLE_DEPRECATION_WARNINGS
-    if (st->internal->nb_bsfcs)
-        av_packet_split_side_data(pkt);
+    if (st->internal->nb_bsfcs) {
+        ret = av_packet_split_side_data(pkt);
+        if (ret < 0)
+            av_log(s, AV_LOG_WARNING, "Failed to split side data before bitstream filter\n");
+    }
 FF_ENABLE_DEPRECATION_WARNINGS
 #endif