Revert "[speech_synthesizer] free previously alloc'd snd_pcm_info_t struct"

This reverts commit 22c1790a7014eba02e171aa1aceb1e6c024c057d

Change-Id: I7cafc15cc45c22d09e6c0031717b16accda30d6e
Reviewed-on: http://gerrit.chromium.org/gerrit/7733
Tested-by: Todd Broch <tbroch@chromium.org>
Reviewed-by: Todd Broch <tbroch@chromium.org>
diff --git a/linux/audio_output_alsa.cc b/linux/audio_output_alsa.cc
index da53427..fdf4c6e 100644
--- a/linux/audio_output_alsa.cc
+++ b/linux/audio_output_alsa.cc
@@ -54,7 +54,6 @@
     }
     snd_ctl_close(ctl);
   }
-  snd_pcm_info_free(pcm_info);
 
   LOG(INFO) << "Total valid playback devices: " << valid_playback_devices;
   if (valid_playback_devices == 0) {
@@ -216,3 +215,4 @@
 }
 
 }  // namespace speech_synthesis
+