Fix linux/gcc compiler warnings in tools/ipc_fuzzer.

Fix linux/gcc compiler warnings in tools/ipc_fuzzer.

It's really sad when your ASCII art breaks the compilation, but ending
a //-style comment line with a \ means the comment continues and this is
flagged as a bad thing (tm).

The other change is a signed/unsigned comparison, which is OK because it
is range checked prior to casting.

BUG=

Committed: https://src.chromium.org/viewvc/chrome?view=rev&revision=241109

[Tom Sepez, 2013-12-14 00:40:20]

Juri, please review.

[aedla, 2013-12-14 14:40:33]

On 2013/12/14 00:40:20, Tom Sepez wrote:
> Juri, please review.

LGTM, thanks.

[commit-bot: I haz the power, 2013-12-16 17:54:06]

CQ is trying da patch. Follow status at
https://chromium-status.appspot.com/cq/tsepez@chromium.org/115673002/1

[commit-bot: I haz the power, 2013-12-16 19:18:11]

Retried try job too often on linux_rel for step(s) browser_tests
http://build.chromium.org/p/tryserver.chromium/buildstatus?builder=linux_rel&...

[commit-bot: I haz the power, 2013-12-16 19:33:17]

CQ is trying da patch. Follow status at
https://chromium-status.appspot.com/cq/tsepez@chromium.org/115673002/1

[commit-bot: I haz the power, 2013-12-16 22:43:20]

Retried try job too often on linux_rel for step(s) browser_tests
http://build.chromium.org/p/tryserver.chromium/buildstatus?builder=linux_rel&...

[commit-bot: I haz the power, 2013-12-16 22:54:08]

CQ is trying da patch. Follow status at
https://chromium-status.appspot.com/cq/tsepez@chromium.org/115673002/1

[commit-bot: I haz the power, 2013-12-17 02:18:42]

Change committed as 241109