* ccl.c: Improve and simplify overflow checking (Bug#9196).
(ccl_driver): Do not generate an out-of-range pointer. (Fccl_execute_on_string): Remove unnecessary check for integer overflow, noted by Stefan Monnier in <http://lists.gnu.org/archive/html/emacs-devel/2011-08/msg00979.html>. Remove a FIXME that didn't need fixing. Simplify the newly-introduced buffer reallocation code.
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