Fix nullptr dereference in FPDF_GenerateAP().

Fix nullptr dereference in FPDF_GenerateAP().

BUG=645954
Committed: https://pdfium.googlesource.com/pdfium/+/717d1330bafb846e4cd25bfb4952bfdedce0db91

[Lei Zhang, 2016-09-20 02:55:27]

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

[commit-bot: I haz the power, 2016-09-20 02:55:37]

Dry run: 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, 2016-09-20 03:08:22]

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

[commit-bot: I haz the power, 2016-09-20 03:08:23]

Dry run: This issue passed the CQ dry run.

[Lei Zhang, 2016-09-20 03:09:04]

thestig@chromium.org changed reviewers:
+ dsinclair@chromium.org, tsepez@chromium.org, weili@chromium.org

[dsinclair, 2016-09-20 12:57:58]

The CQ bit was checked by dsinclair@chromium.org

[dsinclair, 2016-09-20 12:57:59]

lgtm

[commit-bot: I haz the power, 2016-09-20 12:58:05]

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, 2016-09-20 12:58:24]

Description was changed from

==========
Fix nullptr dereference in FPDF_GenerateAP().

BUG=645954
==========

to

==========
Fix nullptr dereference in FPDF_GenerateAP().

BUG=645954

Committed:
https://pdfium.googlesource.com/pdfium/+/717d1330bafb846e4cd25bfb4952bfdedce0...
==========

[commit-bot: I haz the power, 2016-09-20 12:58:25]

Committed patchset #1 (id:1) as
https://pdfium.googlesource.com/pdfium/+/717d1330bafb846e4cd25bfb4952bfdedce0...