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src/io/source_avcodec.c: avoid unused variable

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

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

@@ -349,7 +349,6 @@

   SwrContext *avr = s->avr;

 #endif /* HAVE_AVRESAMPLE || HAVE_SWRESAMPLE */

   int got_frame = 0;

-  int ret = 0;

 #ifdef HAVE_AVRESAMPLE

   int in_linesize = 0;

   int in_samples = avFrame->nb_samples;

@@ -364,6 +363,8 @@

   smpl_t *output = s->output;

 #ifndef FF_API_LAVF_AVCTX

   int len = 0;

+#else

+  int ret = 0;

 #endif

   av_init_packet (&avPacket);

   *read_samples = 0;