Fix a memory leak in MidiManagerAlsa initialization.

Fix a memory leak in MidiManagerAlsa initialization.

Call snd_ctl_close() to free all the resources allocated with
the control handle.

BUG=409016
Committed: https://crrev.com/673572dd420381236cc66d46bf10aa9f1ccfc58e
Cr-Commit-Position: refs/heads/master@{#292875}

[babu, 2014-08-29 16:49:43]

sudarsana.nagineni@intel.com changed reviewers:
+ yukawa@chromium.org

[yukawa, 2014-08-29 17:06:45]

yukawa@chromium.org changed reviewers:
+ agoode@chromium.org, toyoshim@chromium.org
- yukawa@chromium.org

[Takashi Toyoshima, 2014-09-01 13:05:44]

lgtm

Thank you for reporting and fixing this!
It seems that this error can not be found in our trybots since they have no
actual MIDI devices:(

[babu, 2014-09-01 13:57:30]

@toyoshim, thanks for review.

[babu, 2014-09-01 13:57:37]

The CQ bit was checked by sudarsana.nagineni@intel.com

[commit-bot: I haz the power, 2014-09-01 13:57:51]

CQ is trying da patch. Follow status at
 https://chromium-status.appspot.com/cq/sudarsana.nagineni@intel.com/517363002/1

[commit-bot: I haz the power, 2014-09-01 14:53:39]

Committed patchset #1 (id:1) as 8fb3c7a3c1a8c1d72810c88364350787b4798738

[commit-bot: I haz the power, 2014-09-10 03:16:57]

Patchset 1 (id:??) landed as
https://crrev.com/673572dd420381236cc66d46bf10aa9f1ccfc58e
Cr-Commit-Position: refs/heads/master@{#292875}