Re: [PATCH] Suppress Clang 3.9 warnings

Hello Aleksander,

> ```
> xloginsert.c:742:18: warning: implicit conversion from 'int' to 'char'
> changes value from 253 to -3 [-Wconstant-conversion]
> ```

There is a bunch of these in "xlog.c" as well, and the same code is used 
in "pg_resetwal.c".

> Patch that fixes these warnings is attached to this email.

My 0.02€:

I'm not at ease at putting the thing bluntly under the carpet with a cast.

Why not update the target type to "unsigned char" instead, so that no cast 
is needed and the value compatibility is checked by the compiler? I guess 
there would be some more changes (question is how much), but it would be 
cleaner.

-- 
Fabien.