initialize incr in c-parser.c:c_parser_for_statement

[Alexandre Oliva]

Bootstrap fails with bootstrap-O3 because GCC gets the impression that
incr is used without being initialized.  AFAICT the impression is wrong,
and incr is initialized in every path that leads to the use, but it's
not too much of a problem to initialize it with the value that is stored
in it in most other paths anyway.

I'm checking this in as obviously correct.  Regstrapped on
x86_64-linux-gnu and i686-pc-linux-gnu.

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-- 
Alexandre Oliva, freedom fighter    http://FSFLA.org/~lxoliva/
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