Fix for crash in FPDF_GetNamedDest().

Fix for crash in FPDF_GetNamedDest().

pDestObj is getting accessed with NULL value.

Check added so that access does not happen with NULL pointer.

BUG=450133

[Deepak, 2015-01-20 07:20:11]

deepak.m1@samsung.com changed reviewers:
+ raymes@chromium.org, tsepez@chromium.org

[Deepak, 2015-01-20 07:20:12]

PTAL.

[Tom Sepez, 2015-01-20 17:51:12]

LGTM.  Would you happen to have a test case that hits this condition?

[Tom Sepez, 2015-01-20 18:41:34]

tsepez@chromium.org changed reviewers:
+ bo_xu@foxitsoftware.com
- raymes@chromium.org

[Tom Sepez, 2015-01-20 18:42:28]

https://codereview.chromium.org/845643008/diff/1/fpdfsdk/src/fpdfview.cpp
File fpdfsdk/src/fpdfview.cpp (right):

https://codereview.chromium.org/845643008/diff/1/fpdfsdk/src/fpdfview.cpp#new...
fpdfsdk/src/fpdfview.cpp:864: len = -1;
nit: Bo, this looks wrong.  Did you want to set buflen (returned) to -1?

[Bo Xu, 2015-01-20 18:45:56]

https://codereview.chromium.org/845643008/diff/1/fpdfsdk/src/fpdfview.cpp
File fpdfsdk/src/fpdfview.cpp (right):

https://codereview.chromium.org/845643008/diff/1/fpdfsdk/src/fpdfview.cpp#new...
fpdfsdk/src/fpdfview.cpp:864: len = -1;
On 2015/01/20 18:42:28, Tom Sepez wrote:
> nit: Bo, this looks wrong.  Did you want to set buflen (returned) to -1?

Yep, should be buflen = -1;

[Tom Sepez, 2015-01-20 19:07:32]

@Deepak, do you need one of us to land this for you?

[Deepak, 2015-01-21 02:48:12]

The CQ bit was checked by deepak.m1@samsung.com

[Deepak, 2015-01-21 02:48:18]

The CQ bit was unchecked by deepak.m1@samsung.com

[Deepak, 2015-01-21 02:52:45]

The CQ bit was checked by deepak.m1@samsung.com

[commit-bot: I haz the power, 2015-01-21 02:55:47]

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

[commit-bot: I haz the power, 2015-01-21 02:55:47]

Commit queue rejected this change because it did not recognize the base URL.
Please commit your change manually.

[Deepak, 2015-01-21 02:56:32]

The CQ bit was checked by deepak.m1@samsung.com

[commit-bot: I haz the power, 2015-01-21 03:00:50]

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

[commit-bot: I haz the power, 2015-01-21 03:00:52]

Commit queue rejected this change because it did not recognize the base URL.
Please commit your change manually.

[Deepak, 2015-01-21 03:04:21]

On 2015/01/21 03:00:52, I haz the power (commit-bot) wrote:
> Commit queue rejected this change because it did not recognize the base URL.
> Please commit your change manually.

@Tom
Can someone please land this patch for me.
I am not able to land this, because of above error.
Thanks

[Tom Sepez, 2015-01-21 21:16:34]

> @Tom
> Can someone please land this patch for me.
> I am not able to land this, because of above error.
> Thanks

I'll roll this into https://codereview.chromium.org/837723009/.  Thanks for your
patch.