Fix two bugs found by /analyze tool

Fix two bugs found by /analyze tool

The first one is about bitwise AND on zero, the result would always
be zero. The second one is about using wrong bitmasks, the result would cause branches never get executed.

BUG=chromium:613623, chromium:427616
Committed: https://pdfium.googlesource.com/pdfium/+/bbff41927ecce2ff93668aa615307f548ca896eb

[Wei Li, 2016-05-27 20:33:45]

Patchset #1 (id:1) has been deleted

[Wei Li, 2016-05-27 20:35:14]

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

[Wei Li, 2016-05-27 20:35:15]

pls review, thanks

[Wei Li, 2016-05-27 20:35:41]

Description was changed from

==========
Fixed two bugs found by /analyze tool

The first one is about bitwise operator on zero, the result would always
be zero. The second one is about using wrong bitmasks.

BUG=chromium:613623, chromium:427616
==========

to

==========
Fix two bugs found by /analyze tool

The first one is about bitwise operator on zero, the result would always
be zero. The second one is about using wrong bitmasks.

BUG=chromium:613623, chromium:427616
==========

[Wei Li, 2016-05-27 20:38:34]

Description was changed from

==========
Fix two bugs found by /analyze tool

The first one is about bitwise operator on zero, the result would always
be zero. The second one is about using wrong bitmasks.

BUG=chromium:613623, chromium:427616
==========

to

==========
Fix two bugs found by /analyze tool

The first one is about bitwise AND on zero, the result would always
be zero. The second one is about using wrong bitmasks, the result would cause
branches never get executed.

BUG=chromium:613623, chromium:427616
==========

[Tom Sepez, 2016-05-27 21:40:10]

lgtm

[Wei Li, 2016-05-27 21:47:52]

The CQ bit was checked by weili@chromium.org

[commit-bot: I haz the power, 2016-05-27 21:47:56]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/2016243003/20001
View timeline at
 https://chromium-cq-status.appspot.com/patch-timeline/2016243003/20001

[commit-bot: I haz the power, 2016-05-27 21:48:18]

Description was changed from

==========
Fix two bugs found by /analyze tool

The first one is about bitwise AND on zero, the result would always
be zero. The second one is about using wrong bitmasks, the result would cause
branches never get executed.

BUG=chromium:613623, chromium:427616
==========

to

==========
Fix two bugs found by /analyze tool

The first one is about bitwise AND on zero, the result would always
be zero. The second one is about using wrong bitmasks, the result would cause
branches never get executed.

BUG=chromium:613623, chromium:427616

Committed:
https://pdfium.googlesource.com/pdfium/+/bbff41927ecce2ff93668aa615307f548ca8...
==========

[commit-bot: I haz the power, 2016-05-27 21:48:19]

Committed patchset #1 (id:20001) as
https://pdfium.googlesource.com/pdfium/+/bbff41927ecce2ff93668aa615307f548ca8...