clang-format: fix erroneous replacement in lines entirely made of spaces inside C style comments with \r\n end of line

[Daniel Jasper]

Submitted modified version as r239900. Thanks!

On Tue, Jun 16, 2015 at 7:03 AM, Mathieu Champlon <m.champlon at free.fr>
wrote:

> Hi,
>
> Attached patch adds a test and a fix for clang-format.
> The formatting works as expected but replacements get generated every time
> which needlessly touch files when formatting code.
>
> I hope the patch is fine, I created it with git...
>
> Thanks,
> MAT.
>
>
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