[cairo] Tiny bug in fixed_integer_ceil

[Carl Worth]

On Tue, 16 Aug 2005 21:58:22 -0400 (EDT), Behdad Esfahbod wrote:
> The current code would return 1 for 0, which is wrong.

More precisely, the current code depends on implementation-defined
behavior, (>> with a negative left operand). For what it's worth, the
implementation on my system returns 0 for 0.

Since the point of the function as it is currently written is to avoid
>> with a negative left operand, I've committed this change.

-Carl
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