Fix a memory leak in CPDF_SecurityHandler.

Fix a memory leak in CPDF_SecurityHandler.

AES256_CheckPassword() leaks memory on failure.
Clean up some nits.

BUG=chromium:659468
Committed: https://pdfium.googlesource.com/pdfium/+/a3580f9fb0eb11f7a501a28be953ff948c28ce06

[Lei Zhang, 2016-10-31 19:18:35]

The CQ bit was checked by thestig@chromium.org to run a CQ dry run

[commit-bot: I haz the power, 2016-10-31 19:18:45]

Dry run: CQ is trying da patch. Follow status at
 
https://chromium-cq-status.appspot.com/v2/patch-status/codereview.chromium.or...

[Lei Zhang, 2016-10-31 19:19:06]

thestig@chromium.org changed reviewers:
+ dsinclair@chromium.org

[dsinclair, 2016-10-31 19:28:10]

lgtm

[commit-bot: I haz the power, 2016-10-31 19:31:47]

The CQ bit was unchecked by commit-bot@chromium.org

[commit-bot: I haz the power, 2016-10-31 19:31:48]

Dry run: This issue passed the CQ dry run.

[Lei Zhang, 2016-10-31 20:06:18]

The CQ bit was checked by thestig@chromium.org

[commit-bot: I haz the power, 2016-10-31 20:06:25]

CQ is trying da patch. Follow status at
 
https://chromium-cq-status.appspot.com/v2/patch-status/codereview.chromium.or...

[commit-bot: I haz the power, 2016-10-31 20:06:41]

Description was changed from

==========
Fix a memory leak in CPDF_SecurityHandler.

AES256_CheckPassword() leaks memory on failure.
Clean up some nits.

BUG=chromium:659468
==========

to

==========
Fix a memory leak in CPDF_SecurityHandler.

AES256_CheckPassword() leaks memory on failure.
Clean up some nits.

BUG=chromium:659468

Committed:
https://pdfium.googlesource.com/pdfium/+/a3580f9fb0eb11f7a501a28be953ff948c28...
==========

[commit-bot: I haz the power, 2016-10-31 20:06:42]

Committed patchset #1 (id:1) as
https://pdfium.googlesource.com/pdfium/+/a3580f9fb0eb11f7a501a28be953ff948c28...