avformat/sapdec: check return value of avcodec_parameters_copy()

Written in the dominant style of the surrounding code block.

Signed-off-by: Marth64 <marth64@proxyid.net>

libavformat/sapdec.c

@@ -179,7 +179,9 @@ static int sap_read_header(AVFormatContext *s)
             goto fail;
         }
         st->id = i;
-        avcodec_parameters_copy(st->codecpar, sap->sdp_ctx->streams[i]->codecpar);
+        ret = avcodec_parameters_copy(st->codecpar, sap->sdp_ctx->streams[i]->codecpar);
+        if (ret < 0)
+            goto fail;
         st->time_base = sap->sdp_ctx->streams[i]->time_base;
     }