[ccan] New warning with GCC 4.6: -Wunused-but-set-variable

[Joseph Adams]

I tried running `make -j2 check' on CCAN in Fedora 15 (which has GCC
4.6.0), and it failed because of a warning in some of the tests:

Module tests compile (tests_compile): FAIL
/home/joey/ccan/ccan/cast/test/compile_fail-cast_const.c:Compile gave
warnings without -DFAIL:
/home/joey/ccan/ccan/cast/test/compile_fail-cast_const.c: In function ‘main’:
/home/joey/ccan/ccan/cast/test/compile_fail-cast_const.c:11:8:
warning: variable ‘uc’ set but not used [-Wunused-but-set-variable]

The attached patch fixes these warnings.  Otherwise, `make check'
works on Fedora 15.


Joey
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