AudioCodingModuleImpl: Initialize encoder_stack_ to nullptr

AudioCodingModuleImpl: Initialize encoder_stack_ to nullptr

This should have been done in commit 11340, but it was left out by
mistake.

BUG=webrtc:5028
Committed: https://crrev.com/6a07f12e95055dc8501161532118c7ef6db08a75
Cr-Commit-Position: refs/heads/master@{#11378}

[kwiberg-webrtc, 2016-01-25 02:47:38]

Description was changed from

==========
AudioCodingModuleImpl: Initialize encoder_stack_ to nullptr

This should have been done in commit 11340, but it was left out by
mistake.

BUG=webrtc:5028
==========

to

==========
AudioCodingModuleImpl: Initialize encoder_stack_ to nullptr

This should have been done in commit 11340, but it was left out by
mistake.

BUG=webrtc:5028
==========

[kwiberg-webrtc, 2016-01-25 02:47:38]

kwiberg@webrtc.org changed reviewers:
+ henrik.lundin@webrtc.org

[hlundin-webrtc, 2016-01-26 07:19:10]

lgtm

[kwiberg-webrtc, 2016-01-26 09:30:15]

The CQ bit was checked by kwiberg@webrtc.org

[commit-bot: I haz the power, 2016-01-26 09:30:20]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/1631443002/1
View timeline at
 https://chromium-cq-status.appspot.com/patch-timeline/1631443002/1

[commit-bot: I haz the power, 2016-01-26 11:28:53]

Description was changed from

==========
AudioCodingModuleImpl: Initialize encoder_stack_ to nullptr

This should have been done in commit 11340, but it was left out by
mistake.

BUG=webrtc:5028
==========

to

==========
AudioCodingModuleImpl: Initialize encoder_stack_ to nullptr

This should have been done in commit 11340, but it was left out by
mistake.

BUG=webrtc:5028
==========

[commit-bot: I haz the power, 2016-01-26 11:28:54]

Committed patchset #1 (id:1)

[commit-bot: I haz the power, 2016-01-26 11:29:03]

Description was changed from

==========
AudioCodingModuleImpl: Initialize encoder_stack_ to nullptr

This should have been done in commit 11340, but it was left out by
mistake.

BUG=webrtc:5028
==========

to

==========
AudioCodingModuleImpl: Initialize encoder_stack_ to nullptr

This should have been done in commit 11340, but it was left out by
mistake.

BUG=webrtc:5028

Committed: https://crrev.com/6a07f12e95055dc8501161532118c7ef6db08a75
Cr-Commit-Position: refs/heads/master@{#11378}
==========

[commit-bot: I haz the power, 2016-01-26 11:29:03]

Patchset 1 (id:??) landed as
https://crrev.com/6a07f12e95055dc8501161532118c7ef6db08a75
Cr-Commit-Position: refs/heads/master@{#11378}