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Use EMACS_INT, not int, for length.

breaking out part of COMPOSITION_DECODE_RULE.
(COMPOSITION_DECODE_RULE): Use it.
* composite.c (get_composition_id): Remove unused local vars,
by using the new macro.

since the condition is always true at first.

All uses changed.

(exec_sentinel): Remove vars that were set but not used.

so that reader need not know FONT_DPI_INDEX + 1 == FONT_SPACING_INDEX.

Otherwise, GCC 4.6.0 optimizes the loop check away since the check
can always succeed if overflow has undefined behavior.

All callers changed.  This avoids the need for an unused var.

Check for integer overflow on size calculations.

but not used.

Remove vars that are set but not used.