avformat/hlsenc: Check ret

Fixes: CID1609624 Unused value

Sponsored-by: Sovereign Tech Fund
Signed-off-by: Michael Niedermayer <michael@niedermayer.cc>
(cherry picked from commit 7e577165c1)
Signed-off-by: Michael Niedermayer <michael@niedermayer.cc>

libavformat/hlsenc.c

@@ -2590,8 +2590,10 @@ static int hls_write_packet(AVFormatContext *s, AVPacket *pkt)
                            " will retry with a new http session.\n");
                     ff_format_io_close(s, &vs->out);
                     ret = hlsenc_io_open(s, &vs->out, filename, &options);
-                    reflush_dynbuf(vs, &range_length);
-                    ret = hlsenc_io_close(s, &vs->out, filename);
+                    if (ret >= 0) {
+                        reflush_dynbuf(vs, &range_length);
+                        ret = hlsenc_io_close(s, &vs->out, filename);
+                    }
                 }
                 av_dict_free(&options);
                 av_freep(&vs->temp_buffer);
@@ -2602,6 +2604,9 @@ static int hls_write_packet(AVFormatContext *s, AVPacket *pkt)
                 hls_rename_temp_file(s, oc);
         }
 
+        if (ret < 0)
+            return ret;
+
         old_filename = av_strdup(oc->url);
         if (!old_filename) {
             return AVERROR(ENOMEM);