audio_fifo: Drop write-only variable

libavutil/audio_fifo.c

@@ -138,7 +138,7 @@ int av_audio_fifo_write(AVAudioFifo *af, void **data, int nb_samples)
 
 int av_audio_fifo_read(AVAudioFifo *af, void **data, int nb_samples)
 {
-    int i, ret, size;
+    int i, size;
 
     if (nb_samples < 0)
         return AVERROR(EINVAL);
@@ -148,7 +148,7 @@ int av_audio_fifo_read(AVAudioFifo *af, void **data, int nb_samples)
 
     size = nb_samples * af->sample_size;
     for (i = 0; i < af->nb_buffers; i++) {
-        if ((ret = av_fifo_generic_read(af->buf[i], data[i], size, NULL)) < 0)
+        if (av_fifo_generic_read(af->buf[i], data[i], size, NULL) < 0)
             return AVERROR_BUG;
     }
     af->nb_samples -= nb_samples;