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src/io/source_avcodec.c: more fixes for declaration before assignment

--- a/src/io/source_avcodec.c

+++ b/src/io/source_avcodec.c

@@ -362,6 +362,9 @@

   int out_samples = 0;

 #endif /* HAVE_AVRESAMPLE || HAVE_SWRESAMPLE */

   smpl_t *output = s->output;

+#ifndef FF_API_LAVF_AVCTX

+  int len = 0;

+#endif

   av_init_packet (&avPacket);

   *read_samples = 0;

@@ -403,7 +406,7 @@

     }

   }

 #else

-  int len = avcodec_decode_audio4(avCodecCtx, avFrame, &got_frame, &avPacket);

+  len = avcodec_decode_audio4(avCodecCtx, avFrame, &got_frame, &avPacket);

   if (len < 0) {

     AUBIO_ERR("source_avcodec: error while decoding %s\n", s->path);