avformat/movenc: Fix invalid check

Regression since c9de096851.
Fixes Coverity ID 1506839.

Reviewed-by: Jan Ekström <jeebjp@gmail.com>
Signed-off-by: Andreas Rheinhardt <andreas.rheinhardt@outlook.com>

libavformat/movenc.c

@@ -424,7 +424,7 @@ static int handle_eac3(MOVMuxContext *mov, AVPacket *pkt, MOVTrack *track)
     if (!info->pkt && !(info->pkt = av_packet_alloc()))
         return AVERROR(ENOMEM);
 
-    if ((ret = avpriv_ac3_parse_header(&hdr, pkt->data, pkt->size) < 0)) {
+    if ((ret = avpriv_ac3_parse_header(&hdr, pkt->data, pkt->size)) < 0) {
         if (ret == AVERROR(ENOMEM))
             goto end;