avcodec: remove some dead assignments

Signed-off-by: Marton Balint <cus@passwd.hu>

libavcodec/bsf.c

@@ -306,7 +306,6 @@ static int bsf_list_filter(AVBSFContext *bsf, AVPacket *out)
             ret = av_bsf_receive_packet(lst->bsfs[lst->idx-1], out);
             if (ret == AVERROR(EAGAIN)) {
                 /* no more packets from idx-1, try with previous */
-                ret = 0;
                 lst->idx--;
                 continue;
             } else if (ret == AVERROR_EOF) {

libavcodec/decode.c

@@ -300,7 +300,6 @@ static int bsfs_poll(AVCodecContext *avctx, AVPacket *pkt)
         ret = av_bsf_receive_packet(s->bsfs[idx], pkt);
         if (ret == AVERROR(EAGAIN)) {
             /* no packets available, try the next filter up the chain */
-            ret = 0;
             idx--;
             continue;
         } else if (ret < 0 && ret != AVERROR_EOF) {